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Improved water oxidation via Fe doping of CuWO4 photoanodes: Influence of the Fe source and concentrationProject supported by the National Natural Science Foundation of China (Grant No. 11204238) and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2017JM1030). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-13 Yue Sun; Fenqi Du; Donghang Xie; Dongmei Yang; Yang Jiao; Lichao Jia; Haibo Fan
Iron (Fe) was successfully doped in CuWO4 photoanode films with a combined liquid-phase spin-coating method via the dopant sources of Fe(NO3)3, FeSO4 and FeCl3. The microstructure of the prepared films was characterized by x-ray diffraction, scanning electron microscopy, and atomic force microscopy. The light absorption and photoelectric conversion properties were evaluated by the UV-visible absorption
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Structural and electrical transport properties of Cu-doped Fe1–x Cu x Se single crystalsProject supported by the National Key Research and Development of China (Grant No. 2018YFA0704200), the National Natural Science Foundation of China (Grant No. 11834016), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-13 He Li; Ming-Wei Ma; Shao-Bo Liu; Fang Zhou; Xiao-Li Dong
We report the structural and electrical transport properties of Fe1–x Cu x Se (x = 0, 0.02, 0.05, 0.10) single crystals grown by a chemical vapor transport method. Substituting Cu for Fe suppresses both the nematicity and superconductivity of FeSe single crystal, and provokes a metal–insulator transition. Our Hall measurements show that the Cu substitution also changes an electron dominance at low
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Anti-oxidation characteristics of Cr-coating on surface of Ti-45Al-8.5Nb alloy by plasma surface metallurgy techniqueProject supported by the National Natural Science Foundation of China (Grant No. 51601122), the 2019–2020 Intergovernmental Cooperation Projects in Science and Technology of the Ministry of Science and Technology, China (Grant No. CB02-03), the Science and Technology Major Project of Chin. Phys. B (IF 1.223) Pub Date : 2021-02-13 Bing Zhou; Ya-Rong Wang; Ke Zheng; Yong Ma; Yong-Sheng Wang; Sheng-Wang Yu; Yu-Cheng Wu
TiAl-based alloys have received extensive attention recently due to their excellent properties. However, the weak oxidation resistance at temperatures higher than 800 C can limit their further high-temperature structural applications. To improve the oxidation resistance of a high-Nb-content γ-TiAl alloy (Ti-45Al-8.5Nb, in units of at.%), a chromium (Cr) coating is prepared by using the plasma surface
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Compound-induced transparency in three-cavity coupled structureProject supported by the National Natural Science Foundation of China (Grant No. 61575014). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-13 Hao-Ye Qin; Yi-Heng Yin; Ming Ding
We propose a three-cavity coupled cavity optomechanical (COM) structure with tunable system parameters and theoretically investigate the probe-light transmission rate. Numerical calculation of the system’s spectra demonstrates distinctive compound-induced transparency (CIT) characteristics, including multiple transparency windows and sideband dips, which can be explained by a coupling between opto
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Quantum speed limit time and entanglement in a non-Markovian evolution of spin qubits of coupled quantum dots Chin. Phys. B (IF 1.223) Pub Date : 2021-02-13 M. Bagheri Harouni
Quantum speed limit time and entanglement in a system composed of coupled quantum dots are investigated. The excess electron spin in each quantum dot constitutes the physical system (qubit). Also the spin interaction is modeled through the Heisenberg model and the spins are imposed by an external magnetic field. Taking into account the spin relaxation as a non-Markovian process, the quantum speed limit
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Performance analysis of GaN-based high-electron-mobility transistors with postpassivation plasma treatmentProject supported by the National Natural Science Foundation of China (Grant Nos. 61674130 and 61804139). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Xing-Ye Zhou; Xin Tan; Yuan-Jie Lv; Guo-Dong Gu; Zhi-Rong Zhang; Yan-Min Guo; Zhi-Hong Feng; Shu-Jun Cai
AlGaN/GaN high-electron-mobility transistors (HEMTs) with postpassivation plasma treatment are demonstrated and investigated for the first time. The results show that postpassivation plasma treatment can reduce the gate leakage and enhance the drain current. Comparing with the conventional devices, the gate leakage of AlGaN/GaN HEMTs with postpassivation plasma decreases greatly while the drain current
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Strain and interfacial engineering to accelerate hydrogen evolution reaction of two-dimensional phosphorus carbideProject supported by the National Natural Science Foundation of China (Grant Nos. 51772085 and U1830138). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Tao Huang; Yuan Si; Hong-Yu Wu; Li-Xin Xia; Yu Lan; Wei-Qing Huang; Wang-Yu Hu; Gui-Fang Huang
Hydrogen, regarded as a promising energy carrier to alleviate the current energy crisis, can be generated from hydrogen evolution reaction (HER), whereas its efficiency is impeded by the activity of catalysts. Herein, effective strategies, such as strain and interfacial engineering, are imposed to tune the catalysis performance of novel two-dimensional (2D) phosphorus carbide (PC) layers using first-principle
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An electromagnetic view of relay time in propagation of neural signalsProject supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0701302 and 2016YFA0200802) and the Fundamental Research Funds of Shandong University, China (Grant No. 2018GN030). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Jing-Jing Xu; San-Jin Xu; Fan Wang; Sheng-Yong Xu
We review the experimental and computational data about the propagation of neural signals in myelinated axons in mice, cats, rabbits, and frogs published in the past five decades. In contrast to the natural assumption that neural signals occur one by one in time and in space, we figure out that neural signals are highly overlapped in time between neighboring nodes. This phenomenon was occasionally
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Effects of initial electronic state on vortex patterns in counter-rotating circularly polarized attosecond pulsesProject supported by the National Natural Science Foundation of China (Grant No. 12074142), the Natural Science Foundation of Jilin Province of China (Grant No. 20180101225JC), and the Graduate Innovation Fund of Jilin University, China (Grant No. 101832020CX337). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Qi Zhen; Jia-He Chen; Si-Qi Zhang; Zhi-Jie Yang; Xue-Shen Liu
We theoretically investigate the effects of different electronic states as the initial state on the vortex patterns in photoelectron momentum distributions (PMDs) from numerical solutions of the two-dimensional (2D) time-dependent Schrdinger equation (TDSE) of He+ with a pair of counter-rotating circularly polarized attosecond pulses. It is found that the number of spiral arms in vortex patterns is
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Field-induced Nel vector bi-reorientation of a ferrimagnetic insulator in the vicinity of compensation temperatureProject supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303202 and 2016YFA0300803), the National Natural Science Foundation of China (Grant Nos. 11904194, 11727808, and 11674159), and the Fundamental Research Funds for the Central Universities Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Peng Wang; Hui Zhao; Zhongzhi Luan; Siyu Xia; Tao Feng; Lifan Zhou
The spin Hall magnetoresistance (SMR) effect in Pt/Gd3Fe5O12 (GdIG) bilayers was systematically investigated. The sign of SMR changes twice with increasing magnetic field in the vicinity of the magnetization compensation point (T M) of GdIG. However, conventional SMR theory predicts the invariant SMR sign in the heterostructure composed of a heavy metal film in contact with a ferromagnetic or antiferromagnetic
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Modulation of the second-harmonic generation in MoS2 by graphene coveringProject supported by Beijing Natural Science Foundation, China (Grant No. JQ19004), Beijing Excellent Talents Training Support, China (Grant No. 2017000026833ZK11), the National Natural Science Foundation of China (Grant Nos. 52025023, 51991340, and 51991342), the National Key Research and Development Program of China (Grant Nos Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Chunchun Wu; Nianze Shang; Zixun Zhao; Zhihong Zhang; Jing Liang; Chang Liu; Yonggang Zuo; Mingchao Ding; Jinhuan Wang; Hao Hong; Jie Xiong; Kaihui Liu
Nonlinear optical frequency mixing, which describes new frequencies generation by exciting nonlinear materials with intense light field, has drawn vast interests in the field of photonic devices, material characterization, and optical imaging. Investigating and manipulating the nonlinear optical response of target materials lead us to reveal hidden physics and develop applications in optical devices
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Atomistic simulations on adhesive contact of single crystal Cu and wear behavior of Cu–Zn alloyProject supported by the National Key Research and Development Program of China (Grant No. 2018YFC0808800), the Natural Science Foundation of Jiangsu Higher Education Institutions, China (Grant No. 17KJA460002), and the “Six Talent Peaks” of Jiangsu Province, China (Grant No. GDZB-002). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 You-Jun Ye; Le Qin; Jing Li; Lin Liu; Ling-Kang Wu
Atomistic simulations are carried out to investigate the nano-indentation of single crystal Cu and the sliding of the Cu–Zn alloy. As the contact zone is extended due to adhesive interaction between the contact atoms, the contact area on a nanoscale is redefined. A comparison of contact area and contact force between molecular dynamics (MD) and contact theory based on Greenwood–Williamson (GW) model
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Influence of an inserted bar on the flow regimes in the hopperProject supported by the National Natural Science Foundation of China (Grant Nos. 11705256 and 11905272), National Postdoctoral Program for Innovative Talents, China (Grant No. BX201700258), and West Light Foundation of the Chinese Academy of Sciences (Grant No. 2018-98). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Yi Peng; Sheng Zhang; Mengke Wang; Guanghui Yang; Jiangfeng Wan; Liangwen Chen; Lei Yang
We investigated the influence of an inserted bar on the hopper flow experimentally. Three geometrical parameters, size of upper outlet D 1, size of lower outlet D 0, and the height of bar H, are variables here. With varying H we found three regimes: one transition from clogging to a surface flow and another transition from a surface flow to a dense flow. For the dense flow, the flow rate follows Beverloo’s
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Radiation force and torque on a two-dimensional circular cross-section of a non-viscous eccentric layered compressible cylinder in acoustical standing waves Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 F G Mitri
The purpose of this study is to develop an analytical formalism and derive series expansions for the time-averaged force and torque exerted on a compound coated compressible liquid-like cylinder, insonified by acoustic standing waves having an arbitrary angle of incidence in the polar (transverse) plane. The host medium of wave propagation and the eccentric liquid-like cylinder are non-viscous. Numerical
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Investigation of fluorescence resonance energy transfer ultrafast dynamics in electrostatically repulsed and attracted exciton–plasmon systemsProject supported by the National Natural Science Foundation of China (Grant Nos. 10904049 and 61575079), the Science and Technology Development Program of Jilin Province, China (Grant No. 20180101230JC), the Fundamental Research Funds for the Central Universities Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Hong-Yu Tu; Ji-Chao Cheng; Gen-Cai Pan; Lu Han; Bin Duan; Hai-Yu Wang; Qi-Dai Chen; Shu-Ping Xu; Zhen-Wen Dai; Ling-Yun Pan
Following the gradual maturation of synthetic techniques for nanomaterials, exciton–plasmon composites have become a research hot-spot due to their controllable energy transfer through electromagnetic fields on the nanoscale. However, most reports ignore fluorescence resonance energy transfer (FRET) under electrostatic repulsion conditions. In this study, the FRET process is investigated in both electrostatic
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Statistical potentials for 3D structure evaluation: From proteins to RNAsProject supported by the National Natural Science Foundation of China (Grant Nos. 11774272 and 11575128). The numerical calculations related to our work in this review were performed on the supercomputing system in the Supercomputing Center of Wuhan University. Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Ya-Lan Tan; Chen-Jie Feng; Xunxun Wang; Wenbing Zhang; Zhi-Jie Tan
Structure evaluation is critical to in silico 3-dimensional structure predictions for biomacromolecules such as proteins and RNAs. For proteins, structure evaluation has been paid attention over three decades along with protein folding problem, and statistical potentials have been shown to be effective and efficient in protein structure prediction and evaluation. In recent two decades, RNA folding
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Identification of denatured and normal biological tissues based on compressed sensing and refined composite multi-scale fuzzy entropy during high intensity focused ultrasound treatmentProject supported by the National Natural Science Foundation of China (Grant Nos. 11774088 and 11474090). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Shang-Qu Yan; Han Zhang; Bei Liu; Hao Tang; Sheng-You Qian
In high intensity focused ultrasound (HIFU) treatment, it is crucial to accurately identify denatured and normal biological tissues. In this paper, a novel method based on compressed sensing (CS) and refined composite multi-scale fuzzy entropy (RCMFE) is proposed. First, CS is used to denoise the HIFU echo signals. Then the multi-scale fuzzy entropy (MFE) and RCMFE of the denoised HIFU echo signals
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A local refinement purely meshless scheme for time fractional nonlinear Schrdinger equation in irregular geometry regionProject supported by the National Natural Science Foundation of China (Grant Nos. 11501495, 51779215, and 11672259), the Postdoctoral Science Foundation of China (Grant Nos. 2015M581869 and 2015T80589), and the Jiangsu Government Scholarship for Overseas Studies, China (Grant No. Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Tao Jiang; Rong-Rong Jiang; Jin-Jing Huang; Jiu Ding; Jin-Lian Ren
A local refinement hybrid scheme (LRCSPH-FDM) is proposed to solve the two-dimensional (2D) time fractional nonlinear Schrdinger equation (TF-NLSE) in regularly or irregularly shaped domains, and extends the scheme to predict the quantum mechanical properties governed by the time fractional Gross–Pitaevskii equation (TF-GPE) with the rotating Bose–Einstein condensate. It is the first application of
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Evolution of domain structure in Fe3GeTe2 Project supported by the National Key R&D Program of China (Grant Nos. 2017YFA0206202 and 2019YFA0308000), the National Natural Science Foundation of China (Grant Nos. 51871130, 62022089, and 11874405), and the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2019007). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Siqi Yin; Le Zhao; Cheng Song; Yuan Huang; Youdi Gu; Ruyi Chen; Wenxuan Zhu; Yiming Sun; Wanjun Jiang; Xiaozhong Zhang; Feng Pan
Two-dimensional (2D) magnets provide an ideal platform to explore new physical phenomena in fundamental magnetism and to realize the miniaturization of magnetic devices. The study on its domain structure evolution with thickness is of great significance for better understanding the 2D magnetism. Here, we investigate the magnetization reversal and domain structure evolution in 2D ferromagnet Fe3GeTe2
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RF magnetron sputtering induced the perpendicular magnetic anisotropy modification in Pt/Co based multilayersProject supported by the National Key R&D Program of China (Grant No. 2017YFB0405700), the National Natural Science Foundation of China (Grant Nos. 11474272 and 61774144), Beijing Natural Science Foundation Key Program, China (Grant No. Z190007), and the Chinese Academy of Sciences (Grant Nos Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Runze Li; Yucai Li; Yu Sheng; Kaiyou Wang
We demonstrate that radio frequency (RF) magnetron sputtering technique can modify the perpendicular magnetic anisotropy (PMA) of Pt/Co/normal metal (NM) thin films. Influence of ion irradiation during RF magnetron sputtering should not be neglected and it can weaken PMA of the deposited magnetic films. The magnitude of this influence can be controlled by tuning RF magnetron sputtering deposition conditions
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Understanding defect production in an hcp Zr crystal upon irradiation: An energy landscape perspective Chin. Phys. B (IF 1.223) Pub Date : 2021-02-09 Jiting Tian
Primary radiation damage in hcp Zr, including both defect production in a single collision cascade and damage buildup through cascade overlap, is investigated using molecular dynamics (MD) simulations from a potential energy landscape (PEL) perspective. It is found that the material’s response to an energetic particle can be understood as a trajectory in the PEL comprising a fast uphill journey and
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Cluster mean-field study of spinor Bose–Hubbard ladder: Ground-state phase diagram and many-body population dynamicsProject supported by the Key-Area Research and Development Program of GuangDong Province, China (Grant No. 2019B030330001), the National Natural Science Foundation of China (Grant Nos. 11874434 and 11574405), the Science and Technology Program of Guangzhou, China (Grant No. 201904020024) Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Li Zhang; Wenjie Liu; Jiahao Huang; Chaohong Lee
We present a cluster mean-field study for ground-state phase diagram and many-body dynamics of spin-1 bosons confined in a two-chain Bose–Hubbard ladder (BHL). For unbiased BHL, we find superfluid (SF) phase and integer filling Mott insulator (IntMI) phase. For biased BHL, in addition to the SF and IntMI phases, there appears half-integer filling Mott insulator (HIntMI) phase. The phase transition
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Characterization, spectroscopic investigation of defects by positron annihilation, and possible application of synthesized PbO nanoparticlesProject supported by the University Grants Commission (UGC), New Delhi, India, for the departmental CAS scheme (No. F.530/5/CAS/2011(SAP-I)) and from the Department of Science and Technology (DST), Govt. of India under FIST (Fund for Improvement in Science & Technology) Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Sk Irsad Ali; Anjan Das; Apoorva Agrawal; Shubharaj Mukherjee; Maudud Ahmed; P M G Nambissan; Samiran Mandal; Atis Chandra Mandal
Nanocrystalline samples of highly pure lead oxide were prepared by the sol-gel route of synthesis. X-ray diffraction and transmission electron microscopic techniques confirmed the nanocrystallinity of the samples, and the average sizes of the crystallites were found within 20 nm to 35 nm. The nanocrystallites exhibited specific anomalous properties, among which a prominent one is the increased lattice
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Analysis of dark soliton generation in the microcavity with mode-interactionProject supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51705121) and the National Key Research and Development Program of China (Grant No. SQ2019YFE010747). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Xin Xu; Xueying Jin; Jie Cheng; Haoran Gao; Yang Lu; Liandong Yu
Mode-interaction plays an important role in the dark soliton generation in the microcavity. It is beneficial to the excitation of dark solitons, but also facilitates a variety of dark soliton states. Based on the non-normalized Lugiato–Lefever equation, the evolution of dark soliton in the microcavity with mode-interaction is investigated. By means of mode-interaction, the initial continuous wave (CW)
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Ground state cooling of an optomechanical resonator with double quantum interference processesProject supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304503), Key Research and Development Project of Guangdong Province, China (Grant No. 2020B030300001), and the National Natural Science Foundation of China (Grant Nos. 828330256, 11636220, 11805279, 1173401, Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Shuo Zhang; Tan Li; Qian-Hen Duan; Jian-Qi Zhang; Wan-Su Bao
We present a cooling scheme with a tripod configuration atomic ensemble trapped in an optomechanical cavity. With the employment of two different quantum interference processes, our scheme illustrates that it is possible to cool a resonator to its ground state in the strong cavity–atom coupling regime. Moreover, with the assistance of one additional energy level, our scheme takes a larger cooling rate
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Low-temperature environments for quantum computation and quantum simulationProject supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303301), the National Natural Science Foundation of China (Grant Nos. 11674009 and 11921005), the Beijing Natural Science Foundation, China (Grant No. JQ18002), and the Strategic Priority Research Program of Chinese Academy of Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Hailong Fu; Pengjie Wang; Zhenhai Hu; Yifan Li; Xi Lin
This review summarizes the requirement of low temperature conditions in existing experimental approaches to quantum computation and quantum simulation.
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In-situ fabrication of ZnO nanoparticles sensors based on gas-sensing electrode for ppb-level H2S detection at room temperatureProject supported by the National Natural Science Foundation of China (Grant Nos. 11904209 and 61904098), the Natural Science Foundation of Shandong Province, China (Grant No. ZR2019QF018), and Higher Education Research and Development Program of Shandong Province, China (Grant Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Jing-Yue Xuan; Guo-Dong Zhao; Xiao-Bo Shi; Wei Geng; Heng-Zheng Li; Mei-Ling Sun; Fu-Chao Jia; Shu-Gang Tan; Guang-Chao Yin; Bo Liu
The zinc oxide (ZnO) nanoparticles (NPs) sensors were prepared in-situ on the gas-sensing electrodes by a one-step simple sol-gel method for the detection of hydrogen sulfide (H2S) gas. The sphere-like ZnO NPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), energy dispersive x-ray analysis (EDX), and their H2S sensing performance
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Dynamic phase transition of ferroelectric nanotube described by a spin-1/2 transverse Ising modelProject supported by the National Key R&D Program of China (Grant No. 2017YFE0120500), the National Natural Science Foundation of China (Grant No. 51972129), the South Xinjiang Innovation and Development Program of Key Industries of Xinjiang Production and Construction Corps (Grant No. 2020DB002), the Fundamental Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Chundong Wang; Ying Wu; Yulin Cao; Xinying Xue
The dynamic phase transition properties for ferroelectric nanotube under a spin-1/2 transverse Ising model are studied under the effective field theory (EFT) with correlations. The temperature effects on the pseudo-spin systems are unveiled in three-dimensional (3-D) and two-dimensional (2-D) phase diagrams. Moreover, the dynamic behaviors of exchange interactions on the 3-D and 2-D phase transitions
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Quantum algorithm for a set of quantum 2SAT problemsProject supported by the National Key R&D Program of China (Grant Nos. 2017YFA0303302 and 2018YFA0305602), the National Natural Science Foundation of China (Grant No. 11921005), and Shanghai Municipal Science and Technology Major Project, China (Grant No. 2019SHZDZX01). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Yanglin Hu; Zhelun Zhang; Biao Wu
We present a quantum adiabatic algorithm for a set of quantum 2-satisfiability (Q2SAT) problem, which is a generalization of 2-satisfiability (2SAT) problem. For a Q2SAT problem, we construct the Hamiltonian which is similar to that of a Heisenberg chain. All the solutions of the given Q2SAT problem span the subspace of the degenerate ground states. The Hamiltonian is adiabatically evolved so that
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Review of quantum simulation based on Rydberg many-body system Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Zheng-Yuan Zhang; Dong-Sheng Ding; Bao-Sen Shi
Quantum simulation has been developed extensively over the past decades, widely applied to different models to explore dynamics in the quantum regime. Rydberg atoms have strong dipole–dipole interactions and interact with each other over a long distance, which makes it straightforward to build many-body interacting quantum systems to simulate specific models. Additionally, neutral atoms are easily
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State transfer on two-fold Cayley trees via quantum walksProject supported by the National Natural Science Foundation of China (Grant Nos. 61802002 and 61701004), the Natural Science Foundation of Anhui Province, China (Grant No. 1708085MF162), and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20171458). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-06 Xi-Ling Xue; Yue Ruan
Perfect state transfer (PST) has great significance due to its applications in quantum information processing and quantum computation. The main problem we study in this paper is to determine whether the two-fold Cayley tree, an extension of the Cayley tree, admits perfect state transfer between two roots using quantum walks. We show that PST can be achieved by means of the so-called nonrepeating quantum
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Broadband absorption enhancement with ultrathin MoS2 film in the visible regimeProject supported by the National Natural Science Foundation of China (Grant No. 61405217), the Zhejiang Provincial Natural Science Foundation, China (Grant No. LY20F050001), the Anhui Polytechnic University Research Startup Foundation, China (Grant No. 2020YQQ042), and the Pre-research Project of Natural Science Foundation Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Jun Wu
The broadband absorption enhancement effect in ultrathin molybdenum disulfide (MoS2) films is investigated. It is achieved by inserting the MoS2 film between a dielectric film and a one-dimensional silver grating backed with a silver mirror. The broadband absorption enhancement in the visible region is achieved, which exhibits large integrated absorption and short-circuit current density for solar
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Effect of spatially nonlocal versus local optical response of a gold nanorod on modification of the spontaneous emissionProject supported by the National Natural Science Foundation of China (Grant Nos. 11964010, 11564013 and 11464014), the Natural Science Foundation of Hunan Province (Grant No. 2020JJ4495), the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 18C0558) Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Sha-Sha Wen; Meng Tian; Hong Yang; Su-Jun Xie; Xiao-Yun Wang; Yun Li; Jie Liu; Jin-Zhang Peng; Ke Deng; He-Ping Zhao; Yong-Gang Huang
The spontaneous emission rate of a two-level quantum emitter (QE) near a gold nanorod is numerically investigated. Three different optical response models for the free-electron gas are adopted, including the classical Drude local response approximation, the nonlocal hydrodynamic model, and the generalized nonlocal optical response model. Nonlocal optical response leads to a blueshift and a reduction
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Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2 Project supported by the National Natural Science Foundation of China (Grant No. 11574338) and the National Natural Science Foundation of China–China Academy of Engineering Physics NSAF Joint Fund (Grant No. U1530402). The experimental measurements were supported by the Superconducting Electronics Facility (SELF) of Shanghai Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 A B Yu; Z Huang; C Zhang; Y F Wu; T Wang; T Xie; C Liu; H Li; W Peng; H Q Luo; G Mu; H Xiao; L X You; T Hu
The vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting materials. For layered superconductors, the vortex pinning can be enhanced by a strong interlayer interaction in accompany with a suppression of superconducting anisotropy, which remains to be investigated in iron based superconductors (FeSCs) with the layered
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Painlev property, local and nonlocal symmetries, and symmetry reductions for a (2+1)-dimensional integrable KdV equationProject supported by the National Natural Science Foundation of China (Grant Nos. 11975131 and 11435005) and the K C Wong Magna Fund in Ningbo University. Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Xiao-Bo Wang; Man Jia; Sen-Yue Lou
The Painlev property for a (2+1)-dimensional Korteweg–de Vries (KdV) extension, the combined KP3 (Kadomtsev–Petviashvili) and KP4 (cKP3-4), is proved by using Kruskal’s simplification. The truncated Painlev expansion is used to find the Schwartz form, the Bcklund/Levi transformations, and the residual nonlocal symmetry. The residual symmetry is localized to find its finite Bcklund transformation. The
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Folding nucleus and unfolding dynamics of protein 2GB1Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010504) and the National Natural Science Foundation of China (Grant No. 11947302). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Xuefeng Wei; Yanting Wang
The folding of many small proteins is kinetically a two-state process with one major free-energy barrier to overcome, which can be roughly regarded as the inverse process of unfolding. In this work, we first use a Gaussian network model to predict the folding nucleus corresponding to the major free-energy barrier of protein 2GB1, and find that the folding nucleus is located in the β-sheet domain. High-temperature
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Complex coordinate rotation method based on gradient optimizationProject supported by the National Natural Science Foundation of China (Grant Nos. 91636216, 11974382, and 11474316), the Chinese Academy of Sciences Strategic Priority Research Program (Grant No. XDB21020200), and by the YIPA Program. ZCY acknowledges the support of NSERC, SHARCnet, and ACEnet of Canada. Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Zhi-Da Bai; Zhen-Xiang Zhong; Zong-Chao Yan; Ting-Yun Shi
In atomic, molecular, and nuclear physics, the method of complex coordinate rotation is a widely used theoretical tool for studying resonant states. Here, we propose a novel implementation of this method based on the gradient optimization (CCR-GO). The main strength of the CCR-GO method is that it does not require manual adjustment of optimization parameters in the wave function; instead, a mathematically
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Coercivity and microstructure of sintered Nd–Fe–B magnets diffused with Pr–Co, Pr–Al, and Pr–Co–Al alloysProject supported by the Key Research and Development Program of Zhejiang Province, China (Grant No. 2021C01190), the Major Project of Science and Technology Innovation 2025 in Ningbo City, China (Grant No. 2018B10015), Zhejiang Province Public Welfare Technology Application Research Project (Grant Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Lei Jin; Zhe-Huan Jin; Jin-Hao Zhu; Guang-Fei Ding; Bo Zheng; Shuai Guo; Ren-Jie Chen; A-Ru Yan; Xin-Cai Liu
The commercial 42M Nd–Fe–B magnet was treated by grain boundary diffusion (GBD) with Pr70Co30 (PC), Pr70Al30 (PA) and Pr70Co15Al15 (PCA) alloys, respectively. The mechanism of coercivity enhancement in the GBD magnets was investigated. The coercivity was enhanced from 1.63 T to 2.15 T in the PCA GBD magnet, higher than the 1.81 T of the PC GBD magnet and the 2.01 T of the PA GBD magnet. This indicates
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Quantitative coherence analysis of dual phase grating x-ray interferometry with source gratingProject supported by the National Natural Science Foundation of China (Grant Nos. U1532113, 11475170, and 11905041) and the Fundamental Research Funds for the Central Universities, China (Grant No. PA2020GDKC0024). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Zhi-Li Wang; Rui-Cheng Zhou; Li-Ming Zhao; Kun Ren; Wen Xu; Bo Liu; Heng Chen
Dual phase grating x-ray interferometry is compatible with common imaging detectors, and abandons the use of an absorption analyzer grating to reduce the radiation dose. When using x-ray tubes, an absorbing source grating must be introduced into the dual phase grating interferometer. In order to attain a high fringe visibility, in this work we conduct a quantitative coherence analysis of dual phase
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Molecular beam epitaxy growth of iodide thin filmsProject supported by the Science Challenge Project (Grant No. TZ2016004). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Xinqiang Cai; Zhilin Xu; Shuai-Hua Ji; Na Li; Xi Chen
Study of two-dimensional (2D) magnetic materials is important for both fundamental research and application. Here we report molecular beam epitaxy growth of iodides, candidates for exhibiting 2D magnetism. Decomposition of CrI3 is utilized to produce stable gaseous I2 flux. Growth of MnI2, GdI3, and CrI2 down to monolayer is successful achieved by co-depositing I2 and corresponding metal atoms. The
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Propagation properties and radiation force of circular Airy Gaussian vortex beams in strongly nonlocal nonlinear mediumProject supported by the National Natural Science Foundation of China (Grant Nos. 11374108 and 11775083). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Xinyu Liu; Chao Sun; Dongmei Deng
We study the abruptly autofocusing and autodefocusing properties of the circular Airy Gaussian vortex (CAiGV) beams in strongly nonlocal nonlinear medium for the first time through numerical simulations. The magnitude of topological charges and the position of the vortex could change not only the light spot pattern but also the intensity contrast. Meanwhile, we can change the position of the autofocusing
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First-principles study of the co-effect of carbon doping and oxygen vacancies in ZnO photocatalystProject supported by the National Natural Science Foundation of China (Grant No. 11874038) and the State Key Laboratory of Advanced Metallurgy Foundation in China (Grant No. KF19-03). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Jia Shi; Lei Wang; Qiang Gu
Although tuning band structure of optoelectronic semiconductor-based materials by means of doping single defect is an important approach for potential photocatalysis application, C-doping or oxygen vacancy (Vo) as a single defect in ZnO still has limitations for photocatalytic activity. Meanwhile, the influence of co-existence of various defects in ZnO still lacks sufficient studies. Therefore, we
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Characterization of low-resistance ohmic contacts to heavily carbon-doped n-type InGaAsBi films treated by rapid thermal annealingProject supported by the National Natural Science Foundation of China (Grant Nos. 11705277 and 61434006) and the Project of Hubei University of Arts and Science (Grant No. XK2019053). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Shu-Xing Zhou; Li-Kun Ai; Ming Qi; An-Huai Xu; Jia-Sheng Yan; Shu-Sen Li; Zhi Jin
Carbon-doped InGaAsBi films on InP:Fe (100) substrates have been grown by gas source molecular beam epitaxy (GSMBE). The electrical properties and non-alloyed Ti/Pt/Au contact resistance of n-type carbon-doped InGaAsBi films were characterized by Van der Pauw–Hall measurement and transmission line method (TLM) with and without rapid thermal annealing (RTA). It was found that the specific contact resistance
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Analysis and implementation of new fractional-order multi-scroll hidden attractorsProject supported by the National Natural Science Foundation of China (Grant Nos. 61561022 and 61672226). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Li Cui; Wen-Hui Luo; Qing-Li Ou
To improve the complexity of chaotic signals, in this paper we first put forward a new three-dimensional quadratic fractional-order multi-scroll hidden chaotic system, then we use the Adomian decomposition algorithm to solve the proposed fractional-order chaotic system and obtain the chaotic phase diagrams of different orders, as well as the Lyaponov exponent spectrum, bifurcation diagram, and SE complexity
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Effect of non-condensable gas on a collapsing cavitation bubble near solid wall investigated by multicomponent thermal MRT-LBMProject supported by the National Natural Science Foundation of China (Grant Nos. 11874140 and 11574072), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLA201913), the National Key Research and Development Program of China (Grant No. 2016YFC0401600) Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Yu Yang; Ming-Lei Shan; Qing-Bang Han; Xue-Fen Kan
A multicomponent thermal multi-relaxation-time (MRT) lattice Boltzmann method (LBM) is presented to study collapsing cavitation bubble. The simulation results satisfy Laplace law and the adiabatic law, and are consistent with the numerical solution of the Rayleigh–Plesset equation. To study the effects of the non-condensable gas inside bubble on collapsing cavitation bubble, a numerical model of single
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Snapback-free shorted anode LIGBT with controlled anode barrier and resistanceProject supported by the National Natural Science Foundation of China (Grant Nos. 61604027 and 61704016) and the Fund from Chongqing Technology Innovation and Application Development (Key Industry Research and Development), China (Grant No. cstc2018jszx-cyzd0646). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Shun Li; Jin-Sha Zhang; Wei-Zhong Chen; Yao Huang; Li-Jun He; Yi Huang
A novel shorted anode lateral-insulated gate bipolar transistor (SA LIGBT) with snapback-free characteristic is proposed and investigated. The device features a controlled barrier V barrier and resistance R SA in anode, named CBR LIGBT. The electron barrier is formed by the P-float/N-buffer junction, while the anode resistance includes the polysilicon layer and N-float. At forward conduction stage
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Theoretical research on terahertz wave generation from planar waveguide by optimized cascaded difference frequency generationProject supported by the National Natural Science Foundation of China (Grant Nos. 61735010, 31671580, and 61601183), Natural Science Foundation of Henan Province, China (Grant No. 162300410190), and Program for Science & Technology Innovation Talents in Universities of Henan Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Zhongyang Li; Jia Zhao; Wenkai Liu; Qingfeng Hu; Yongjun Li; Binzhe Jiao; Pibin Bing; Hongtao Zhang; Lian Tan; Jianquan Yao
A novel scheme for high-efficiency terahertz (THz) wave generation based on optimized cascaded difference frequency generation (OCDFG) with planar waveguide is presented. The phase mismatches of each-order cascaded difference frequency generation (CDFG) are modulated by changing the thickness of the waveguide, resulting in a decrement of phase mismatches in cascaded Stokes processes and an increment
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A novel plasmonic refractive index sensor based on gold/silicon complementary grating structureProject supported by the National Natural Science Foundation of China (Grant No. 61865008) and the Scientific Research Fund of Sichuan Provincial Science Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Xiangxian Wang; Jiankai Zhu; Yueqi Xu; Yunping Qi; Liping Zhang; Hua Yang; Zao Yi
A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength. The reflection spectra and the electric field distributions are obtained via the finite-difference time-domain method. Numerical simulation results show that multiple surface plasmon resonance modes can be excited in this novel structure. Subsequently,
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Investigation of bright and dark solitons in α, β-Fermi Pasta Ulam lattice Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Nkeh Oma Nfor; Serge Bruno Yamgou; Francois Marie Moukam Kakmeni
We consider the Hamiltonian of α, β-Fermi Pasta Ulam lattice and explore the Hamilton–Jacobi formalism to obtain the discrete equation of motion. By using the continuum limit approximations and incorporating some normalized parameters, the extended Korteweg–de Vries equation is obtained, with solutions that elucidate on the Fermi Pasta Ulam paradox. We further derive the nonlinear Schrdinger amplitude
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Ground-state cooling based on a three-cavity optomechanical system in the unresolved-sideband regimeProject supported by the Research Fund of Tonghua Normal University (Grant No. 202017ND). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 Jing Wang
In the unresolved sideband regime, we propose a scheme for cooling mechanical resonator close to its ground state in a three-cavity optomechanical system, where the auxiliary cavities are indirectly connected with the mechanical resonator through standard optomechanical subsystem. The standard optomechanical subsystem is driven by a strong pump laser field. With the help of the auxiliary cavities,
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A multi-directional controllable multi-scroll conservative chaos generator: Modelling, analysis, and FPGA implementationProject supported by the Natural Science Foundation of Tianjin, China (Grant No. 18JCYBJC87700) and the Natural Science Foundation of China (Grant No. 61603274). Chin. Phys. B (IF 1.223) Pub Date : 2021-02-02 En-Zeng Dong; Rong-Hao Li; Sheng-Zhi Du
Combing with the generalized Hamiltonian system theory, by introducing a special form of sinusoidal function, a class of n-dimensional (n = 1,2,3) controllable multi-scroll conservative chaos with complicated dynamics is constructed. The dynamics characteristics including bifurcation behavior and coexistence of the system are analyzed in detail, the latter reveals abundant coexisting flows. Furthermore
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Internal friction behavior of Zr59Fe18Al10Ni10Nb3 metallic glass under different aging temperatures Chin. Phys. B (IF 1.223) Pub Date : 2021-01-30 Israa Faisal Ghazi; Israa Meften Hashim; Aravindhan Surendar; Nalbiy Salikhovich Tuguz; Aseel M. Aljeboree; Ayad F. Alkaim; Nisith Geetha
We investigate the role of aging temperature on relaxation of internal friction in Zr59Fe18Al10Ni10Nb3 metallic glass. For this purpose, dynamic mechanical analysis with different annealing temperatures and frequency values is applied. The results indicate that the aging process leads to decrease in the dissipated energy in the temperature range of glass transition. It is also found that the increase
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A fast and precise three-dimensional measurement system based on multiple parallel line lasers Chin. Phys. B (IF 1.223) Pub Date : 2021-01-30 Yao Wang; Bin Lin
This paper conducts a trade-off between efficiency and accuracy of three-dimensional (3D) shape measurement based on the triangulation principle, and introduces a flying and precise 3D shape measurement method based on multiple parallel line lasers. Firstly, we establish the measurement model of the multiple parallel line lasers system, and introduce the concept that multiple base planes can help to
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Coherent-driving-assisted quantum speedup in Markovian channelsProject supported by the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2020MA086) and the National Natural Science Foundation of China (Grant Nos. 61675115 and 11974209). Chin. Phys. B (IF 1.223) Pub Date : 2021-01-30 Xiang Lu; Ying-Jie Zhang; Yun-Jie Xia
As is well known, the quantum evolution speed of quantum state can never be accelerated in the Markovian regime without any operators on the system. The Hamiltonian corrections induced by the action of coherent driving forces are often used to fight dissipative and decoherence mechanisms in experiments. For this reason, considering three noisy channels (the phase-flip channel, the amplitude damping
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Evidence of potential change in nonsequential double ionizationProject supported by the National Natural Science Foundation of China (Grant No. 11274219), the Science and Technology Planning Project of Guangdong Province of China (Grant No. 180917124960522), and the Program for Promotion of Science at Universities in Guangdong Province of China (Grant No. 2018KTSCX062). Chin. Phys. B (IF 1.223) Pub Date : 2021-01-30 Changchun Jia; Pu Zhang; Hua Wen; Zhangjin Chen
Recently, the quantitative rescattering model (QRS) for nonsequential double ionization (NSDI) is modified by taking into account the potential change (PC) due to the presence of electric field at the time of recollision. Using the improved QRS model, we simulate the longitudinal momentum distributions of doubly charged ions He2+ by projecting the correlated two-electron momentum distributions for
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High-frequency magnetic properties and core loss of carbonyl iron composites with easy plane-like structuresProject supported by the National Natural Science Foundation of China (Grant Nos. 11574122 and 51731001) and Joint Fund of Equipment Pre-Research and Ministry of Education, China (Grant No. 6141A02033242). Chin. Phys. B (IF 1.223) Pub Date : 2021-01-30 Guo-Wu Wang; Chun-Sheng Guo; Liang Qiao; Tao Wang; Fa-Shen Li
To fully release the potential of wide bandgap (WBG) semiconductors and achieve high energy density and efficiency, a carbonyl iron soft magnetic composite (SMC) with an easy plane-like structure is prepared. Due to this structure, the permeability of the composite increases by 3 times (from 7.5 to 21.5) at 100 MHz compared with to the spherical carbonyl iron SMC, and the permeability changes little
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Erratum to “Fabrication of Tl2Ba2CaCu2O8 superconducting films without thallium pellets Chin. Phys. B (IF 1.223) Pub Date : 2021-01-26 Teng-Da Xu; Jian Xing; Li-Tian Wang; Jin-Li Zhang; Sheng-Hui Zhao; Yang Xiong; Xin-Jie Zhao; Lu Ji; Xu Zhang; Ming He
Figure 2 in the original paper (Chin. Phys. B 27 057403 (2018)]) is replaced by a new one.
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Continuous-wave operation of InAs/InP quantum dot tunable external-cavity laser grown by metal-organic chemical vapor depositionProject supported by the National Natural Science Foundation of China (Grant No. 61974141), Tianjin Municipal Science and Technology Bureau, and Science and Technology Innovation Bureau of China-Singapore Tianjin Eco-City. Chin. Phys. B (IF 1.223) Pub Date : 2021-01-26 Yan Wang; Shuai Luo; Haiming Ji; Di Qu; Yidong Huang
We demonstrate high-performance broadband tunable external-cavity lasers (ECLs) with the metal-organic chemical vapor deposition (MOCVD) grown InAs/InP quantum dots (QDs) structures. Without cavity facet coatings, the 3-dB spectral bandwidth of the Fabry–Perot (FP) laser is approximately 10.8 nm, while the tuning bandwidth of ECLs is 45 nm. Combined with the anti-reflection (AR) / high-reflection (HR)
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Monolithic epitaxy and optoelectronic properties of single-crystalline γ-In2Se3 thin films on micaProject supported by the National Key R&D Program of China (Grant Nos. 2018YFA0306102 and 2018YFA0306703), the National Natural Science Foundation of China (Grant No. 61474014), the Sichuan Science and Technology Program, China (Grant No.2019YJ0202), and the University Program for Elaborate Courses of Chin. Phys. B (IF 1.223) Pub Date : 2021-01-26 Xibo Yin; Yifan Shen; Chaofan Xu; Jing He; Junye Li; Haining Ji; Jianwei Wang; Handong Li; Xiaohong Zhu; Xiaobin Niu; Zhiming Wang
The growth of γ-In2Se3 thin films on mica by molecular beam epitaxy is studied. Single-crystalline γ-In2Se3 is achieved at a relatively low growth temperature. An ultrathin β-In2Se3 buffer layer is observed to nucleate and grow through a process of self-organization at initial deposition, which facilitates subsequent monolithic epitaxy of single-crystalline γ-In2Se3 at low temperature. Strong room-temperature
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Correlated insulating phases in the twisted bilayer grapheneYDL and ZYM acknowledge support from the National Key Research and Development Program of China (Grant No. 2016YFA0300502) and the Research Grants Council of Hong Kong SAR China (Grant Nos. 17303019 and 17301420). JK is supported by Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, China. Chin. Phys. B (IF 1.223) Pub Date : 2021-01-26 Yuan-Da Liao; Xiao-Yan Xu; Zi-Yang Meng; Jian Kang
We review analytical and numerical studies of correlated insulating states in twisted bilayer graphene, focusing on real-space lattice models constructions and their unbiased quantum many-body solutions. We show that by constructing localized Wannier states for the narrow bands, the projected Coulomb interactions can be approximated by interactions of cluster charges with assisted nearest neighbor
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