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Tasting nuclear pasta made with classical molecular dynamics simulations Front Phys. (IF 2.502) Pub Date : 2021-01-14 Bao-An Li
Nuclear clusters or voids in the inner crust of neutron stars were predicted to have various shapes collectively nicknamed nuclear pasta. The recent review in Ref. [1] by López, Dorso and Frank summarized their systematic investigations into properties especially the morphological and thermodynamical phase transitions of the nuclear pasta within a Classical Molecular Dynamics model, providing further
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Tuning the magnetic and electronic properties of strontium titanate by carbon doping Front Phys. (IF 2.502) Pub Date : 2021-01-14 Hui Zeng, Meng Wu, Hui-Qiong Wang, Jin-Cheng Zheng, Junyong Kang
The magnetic and electronic properties of strontium titanate with different carbon dopant configurations are explored using first-principles calculations with a generalized gradient approximation (GGA) and the GGA+U approach. Our results show that the structural stability, electronic properties and magnetic properties of C-doped SrTiCO3 strongly depend on the distance between carbon dopants. In both
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Tight upper bound on the quantum value of Svetlichny operators under local filtering and hidden genuine nonlocality Front Phys. (IF 2.502) Pub Date : 2021-01-10 Ling-Yun Sun, Li Xu, Jing Wang, Ming Li, Shu-Qian Shen, Lei Li, Shao-Ming Fei
Nonlocal quantum correlations among the quantum subsystems play essential roles in quantum science. The violation of the Svetlichny inequality provides sufficient conditions of genuine tripartite nonlocality. We provide tight upper bounds on the maximal quantum value of the Svetlichny operators under local filtering operations, and present a qualitative analytical analysis on the hidden genuine nonlocality
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The PQCD approach towards to next-to-leading order: A short review Front Phys. (IF 2.502) Pub Date : 2021-01-06 Shan Cheng, Zhen-Jun Xiao
In this short review we elaborate the significance of resummation in kT factorization theorem, and summarize the recent progresses in the calculations of the next-to-leading order contributions to B meson decays from the perturbative QCD (PQCD) approach. We also comment on the current status of the PQCD approach and highlight some key issues to develop it in the near future for more phenomenological
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Tensile properties of structural I clathrate hydrates: Role of guest—host hydrogen bonding ability Front Phys. (IF 2.502) Pub Date : 2021-01-06 Yue Xin, Qiao Shi, Ke Xu, Zhi-Sen Zhang, Jian-Yang Wu
Clathrate hydrates (CHs) are one of the most promising molecular structures in applications of gas capture and storage, and gas separations. Fundamental knowledge of mechanical characteristics of CHs is of crucial importance for assessing gas storage and separations at cold conditions, as well as understanding their stability and formation mechanisms. Here, the tensile mechanical properties of structural
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Extracting the phase distribution of the electron wave packet ionized by an elliptically polarized laser pulse Front Phys. (IF 2.502) Pub Date : 2020-12-28 Ya-Nan Qin, Min Li, Yudi Feng, Siqiang Luo, Yueming Zhou, Peixiang Lu
We use an interferometic scheme to extract the phase distribution of the electron wave packet from above-threshold ionization in elliptically polarized laser fields. In this scheme, an electron wave packet released from a circularly polarized laser pulse acts as a reference wave and interferes with the electron wave packet ionized by a time-delayed counter-rotating elliptically polarized laser field
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Analytic phase structures and thermodynamic curvature for the charged AdS black hole in alternative phase space Front Phys. (IF 2.502) Pub Date : 2020-12-28 Zhen-Ming Xu
In this paper, we visit the thermodynamic criticality and thermodynamic curvature of the charged AdS black hole in a new phase space. It is shown that when the square of the total charge of the charged black hole is considered as a thermodynamic quantity, the charged AdS black hole also admits a van der Waals-type critical behavior without the help of thermodynamic pressure and thermodynamic volume
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Generic security analysis framework for quantum secure direct communication Front Phys. (IF 2.502) Pub Date : 2020-12-28 Zhang-Dong Ye, Dong Pan, Zhen Sun, Chun-Guang Du, Liu-Guo Yin, Gui-Lu Long
Quantum secure direct communication provides a direct means of conveying secret information via quantum states among legitimate users. The past two decades have witnessed its great strides both theoretically and experimentally. However, the security analysis of it still stays in its infant. Some practical problems in this field to be solved urgently, such as detector efficiency mismatch, side-channel
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Abstract models for heat engines Front Phys. (IF 2.502) Pub Date : 2020-12-28 Zhan-Chun Tu
We retrospect three abstract models for heat engines which include a classic abstract model in textbook of thermal physics, a primary abstract model for finite-time heat engines, and a refined abstract model for finite-time heat engines. The detailed models of heat engines in literature of finite-time thermodynamics may be mapped into the refined abstract model. The future developments based on the
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Theory, preparation, properties and catalysis application in 2D graphynes-based materials Front Phys. (IF 2.502) Pub Date : 2020-12-27 Ning Zhang, Jiayu Wu, Taoyuan Yu, Jiaqi Lv, He Liu, Xiping Xu
Carbon has three hybridization forms of sp−, sp2− and sp3−, and the combination of different forms can obtain different kinds of carbon allotropes, such as diamond, carbon nanotubes, fullerene, graphynes (GYs) and graphdiyne (GDY). Among them, the GDY molecule is a single-layer two-dimensional (2D) planar structure material with highly π-conjugation formed by sp− and sp2− hybridization. GDY has a carbon
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On-chip multiphoton Greenberger—Horne—Zeilinger state based on integrated frequency combs Front Phys. (IF 2.502) Pub Date : 2020-12-27 Pingyu Zhu, Qilin Zheng, Shichuan Xue, Chao Wu, Xinyao Yu, Yang Wang, Yingwen Liu, Xiaogang Qiang, Junjie Wu, Ping Xu
One of the most important multipartite entangled states, Greenberger-Horne-Zeilinger state (GHZ), serves as a fundamental resource for quantum foundation test, quantum communication and quantum computation. To increase the number of entangled particles, significant experimental efforts should been invested due to the complexity of optical setup and the difficulty in maintaining the coherence condition
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Compound plasmonic vortex generation based on spiral nanoslits Front Phys. (IF 2.502) Pub Date : 2020-12-27 Chang-Da Zhou, Zhen Mou, Rui Bao, Zhong Li, Shu-Yun Teng
In view of wide applications of structured light fields and plasmonic vortices, we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators. This kind of structured plasmonic vortex generators consists of multiple spiral nanoslits and they can generate two or more concentric plasmonic vortices. Different from Laguerre-Gaussian beam, the topological
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Measuring orbital angular momentum of vortex beams in optomechanics Front Phys. (IF 2.502) Pub Date : 2020-12-04 Zhucheng Zhang, Jiancheng Pei, Yi-Ping Wang, Xiaoguang Wang
Measuring the orbital angular momentum (OAM) of vortex beams, including the magnitude and the sign, has great application prospects due to its theoretically unbounded and orthogonal modes. Here, the sign-distinguishable OAM measurement in optomechanics is proposed, which is achieved by monitoring the shift of the transmission spectrum of the probe field in a double Laguerre-Gaussian (LG) rotational-cavity
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Laser cooling with adiabatic passage for type-II transitions Front Phys. (IF 2.502) Pub Date : 2020-12-04 Qian Liang, Tao Chen, Wen-Hao Bu, Yu-He Zhang, Bo Yan
We extend the idea of laser cooling with adiabatic passage to multi-level type-II transitions. We find the cooling force can be significantly enhanced when a proper magnetic field is applied. That is because the magnetic field decomposes the multi-level system into several two-level sub-systems, hence the stimulated absorption and stimulated emission can occur in order, allowing for the multiple photon
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A new form of liquid matter: Quantum droplets Front Phys. (IF 2.502) Pub Date : 2020-12-02 Zhi-Huan Luo, Wei Pang, Bin Liu, Yong-Yao Li, Boris A. Malomed
This brief review summarizes recent theoretical and experimental results which predict and establish the existence of quantum droplets (QDs), i.e., robust two- and three-dimensional (2D and 3D) self-trapped states in Bose-Einstein condensates (BECs), which are stabilized by effective self-repulsion induced by quantum fluctuations around the mean-field (MF) states [alias the Lee-Huang-Yang (LHY) effect]
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Properties of nuclear pastas Front Phys. (IF 2.502) Pub Date : 2020-11-25 Jorge A. López, Claudio O. Dorso, Guillermo Frank
In this review we study the nuclear pastas as they are expected to be formed in neutron star crusts. We start with a study of the pastas formed in nuclear matter (composed of protons and neutrons), we follow with the role of the electron gas on the formation of pastas, and we then investigate the pastas in neutron star matter (nuclear matter embedded in an electron gas). Nuclear matter (NM) at intermediate
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Erratum to: Superconductivity and spin fluctuations Front Phys. (IF 2.502) Pub Date : 2020-11-17 Shiliang Li, Pengcheng Dai
In the original publication of this article the DOI number is incorrect. It should be doi:10.1007/s11467-011-0221-0.
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The unique carrier mobility of Janus MoSSe/GaN heterostructures Front Phys. (IF 2.502) Pub Date : 2020-11-17 Wen-Jin Yin, Xiao-Long Zeng, Bo Wen, Qing-Xia Ge, Ying Xu, Gilberto Teobaldi, Li-Min Liu
Heterostructure is an effective approach in modulating the physical and chemical behavior of materials. Here, the first-principles calculations were carried out to explore the structural, electronic, and carrier mobility properties of Janus MoSSe/GaN heterostructures. This heterostructure exhibits a superior high carrier mobility of 281.28 cm2·V−1·s−1 for electron carrier and 3951.2 cm2·V−1·s−1 for
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Full counting statistics of phonon transport in disordered systems Front Phys. (IF 2.502) Pub Date : 2020-11-17 Chao Zhang, Fuming Xu, Jian Wang
The coherent potential approximation (CPA) within full counting statistics (FCS) formalism is shown to be a suitable method to investigate average electric conductance, shot noise as well as higher order cumulants in disordered systems. We develop a similar FCS-CPA formalism for phonon transport through disordered systems. As a byproduct, we derive relations among coefficients of different phonon current
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Recent progress in all-inorganic metal halide nanostructured perovskites: Materials design, optical properties, and application Front Phys. (IF 2.502) Pub Date : 2020-11-17 Lianzhen Cao, Xia Liu, Yingde Li, Xiusheng Li, Lena Du, Shengyao Chen, Shenlong Zhao, Cong Wang
Low-dimensional all-inorganic metal halide perovskite (AIMHP) materials, as a new class of nanomaterials, hold great promise for various optoelectronic devices. In the past few years, tremendous progress has been achieved in the development of efficient and stable AIMHP nanomaterials for optical property studies and related applications. Here, we offer a critical overview on the unique merits and the
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Kinetic modeling of multiphase flow based on simplified Enskog equation Front Phys. (IF 2.502) Pub Date : 2020-11-06 Yu-Dong Zhang, Ai-Guo Xu, Jing-Jiang Qiu, Hong-Tao Wei, Zung-Hang Wei
A new kinetic model for multiphase flow was presented under the framework of the discrete Boltzmann method (DBM). Significantly different from the previous DBM, a bottom-up approach was adopted in this model. The effects of molecular size and repulsion potential were described by the Enskog collision model; the attraction potential was obtained through the mean-field approximation method. The molecular
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Free control of far-field scattering angle of transmission terahertz wave using multilayer split-ring resonators’ metasurfaces Front Phys. (IF 2.502) Pub Date : 2020-11-06 Ying Tian, Xufeng Jing, Haiyong Gan, Chenxia Li, Zhi Hong
To enhance transmission efficiency of Pancharatnam-Berry (PB) phase metasurfaces, multilayer split-ring resonators were proposed to develop encoding sequences. As per the generalized Snell’s law, the deflection angle of the PB phase encoding metasurfaces depends on the metasurface period’s size. Therefore, it is impossible to design an infinitesimal metasurface unit; consequently, the continuous transmission
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Resource reduction for simultaneous generation of two types of continuous variable nonclassical states Front Phys. (IF 2.502) Pub Date : 2020-10-27 Long Tian, Shao-Ping Shi, Yu-Hang Tian, Ya-Jun Wang, Yao-Hui Zheng, Kun-Chi Peng
We demonstrate experimentally the simultaneous generation and detection of two types of continuous variable nonclassical states from one type-0 phase-matching optical parametric amplifcation (OPA) and subsequent two ring flter cavities (RFCs). The output feld of the OPA includes the baseband ω0 and sideband modes ω0± nωf subjects to the cavity resonance condition, which are separated by two cascaded
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Mechanism of signal uncertainty generation for laser-induced breakdown spectroscopy Front Phys. (IF 2.502) Pub Date : 2020-10-27 Yang-Ting Fu, Wei-Lun Gu, Zong-Yu Hou, Sher Afgan Muhammed, Tian-Qi Li, Yun Wang, Zhe Wang
Relatively large measurement uncertainty severely hindered wide application for laser-induced breakdown spectroscopy (LIBS), therefore it is of great importance to understand the mechanism of signal uncertainty generation, including initiation and propagation. It has been found that the fluctuation of plasma morphology was the main reason for signal uncertainty. However, it still remains unclear what
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Quantum droplets in two-dimensional optical lattices Front Phys. (IF 2.502) Pub Date : 2020-10-27 Yi-Yin Zheng, Shan-Tong Chen, Zhi-Peng Huang, Shi-Xuan Dai, Bin Liu, Yong-Yao Li, Shu-Rong Wang
We study the stability of zero-vorticity and vortex lattice quantum droplets (LQDs), which are described by a two-dimensional (2D) Gross–Pitaevskii (GP) equation with a periodic potential and Lee–Huang–Yang (LHY) term. The LQDs are divided in two types: onsite-centered and offsite-centered LQDs, the centers of which are located at the minimum and the maximum of the potential, respectively. The stability
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Two-dimensional Janus van der Waals heterojunctions: A review of recent research progresses Front Phys. (IF 2.502) Pub Date : 2020-10-24 Lin Ju, Mei Bie, Xiwei Zhang, Xiangming Chen, Liangzhi Kou
Two-dimensional Janus van der Waals (vdW) heterojunctions, referring to the junction containing at least one Janus material, are found to exhibit tuneable electronic structures, wide light adsorption spectra, controllable contact resistance, and sufficient redox potential due to the intrinsic polarization and unique interlayer coupling. These novel structures and properties are promising for the potential
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Nonideal double-slope effect in organic field-effect transistors Front Phys. (IF 2.502) Pub Date : 2020-10-24 Ming-Chao Xiao, Jie Liu, Yuan-Yuan Hu, Shuai Wang, Lang Jiang
With the development of device engineering and molecular design, organic field effect transistors (OFETs) with high mobility over 10 cm2·V−1·s−1 have been reported. However, the nonideal double-slope effect has been frequently observed in some of these OFETs, which makes it difficult to extract the intrinsic mobility OFETs accurately, impeding the further application of them. In this review, the origin
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Tactile and temperature sensors based on organic transistors: Towards e-skin fabrication Front Phys. (IF 2.502) Pub Date : 2020-10-07 Miao Zhu, Muhammad Umair Ali, Changwei Zou, Wei Xie, Songquan Li, Hong Meng
Tactile and temperature sensors are the key components for e-skin fabrication. Organic transistors, a kind of intrinsic logic devices with diverse internal configurations, offer a wide range of options for sensor design and have played a vital role in the fabrication of e-skin-oriented tactile and temperature sensors. This research field has attained tremendous advancements, both in terms of materials
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Dissipation-induced topological phase transition and periodic-driving-induced photonic topological state transfer in a small optomechanical lattice Front Phys. (IF 2.502) Pub Date : 2020-10-07 Lu Qi, Guo-Li Wang, Shutian Liu, Shou Zhang, Hong-Fu Wang
We propose a scheme to investigate the topological phase transition and the topological state transfer based on the small optomechanical lattice under the realistic parameters regime. We find that the optomechanical lattice can be equivalent to a topologically nontrivial Su-Schrieffer-Heeger (SSH) model via designing the effective optomechanical coupling. Especially, the optomechanical lattice experiences
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Interlayer coupling effect in van der Waals heterostructures of transition metal dichalcogenides Front Phys. (IF 2.502) Pub Date : 2020-10-05 Yuan-Yuan Wang, Feng-Ping Li, Wei Wei, Bai-Biao Huang, Ying Dai
Van der Waals (vdW) heterobilayers formed by two-dimensional (2D) transition metal dichalcogenides (TMDCs) created a promising platform for various electronic and optical properties, ab initio band results indicate that the band offset of type-II band alignment in TMDCs vdW heterobilayer could be tuned by introducing Janus WSSe monolayer, instead of an external electric field. On the basis of symmetry
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Investigation on the Cs 6 S 1/2 to 7 D electric quadrupole transition via monochromatic two-photon process at 767 nm Front Phys. (IF 2.502) Pub Date : 2020-10-05 San-Dan Wang, Jin-Peng Yuan, Li-Rong Wang, Lian-Tuan Xiao, Suo-Tang Jia
We experimentally demonstrate the cesium electric quadrupole transition from the 6S1/2 ground state to the 7D3/2,5/2 excited state through a virtual level by using a single laser at 767 nm. The excited state energy level population is characterized by varying the laser power, the temperature of the vapor, and the polarization combinations of the laser beams. The optimized experimental parameters are
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Measurement-device-independent quantum key distribution of multiple degrees of freedom of a single photon Front Phys. (IF 2.502) Pub Date : 2020-10-19 Yu-Fei Yan, Lan Zhou, Wei Zhong, Yu-Bo Sheng
Measurement-device-independent quantum key distribution (MDI-QKD) provides us a powerful approach to resist all attacks at detection side. Besides the unconditional security, people also seek for high key generation rate, but MDI-QKD has relatively low key generation rate. In this paper, we provide an efficient approach to increase the key generation rate of MDI-QKD by adopting multiple degrees of
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Mechanical properties of lateral transition metal dichalcogenide heterostructures Front Phys. (IF 2.502) Pub Date : 2020-10-19 Sadegh Imani Yengejeh, William Wen, Yun Wang
Transition metal dichalcogenide (TMD) monolayers attract great attention due to their specific structural, electronic and mechanical properties. The formation of their lateral heterostructures allows a new degree of flexibility in engineering electronic and optoelectronic dervices. However, the mechanical properties of the lateral heterostructures are rarely investigated. In this study, a comparative
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Dense skyrmion crystal stabilized through interfacial exchange coupling: Role of in-plane anisotropy Front Phys. (IF 2.502) Pub Date : 2020-10-17 Ming-Xiu Sui, Zi-Bo Zhang, Xiao-Dan Chi, Jia-Yu Zhang, Yong Hu
A Monte Carlo simulated-annealing algorithm was used to study the magnetic state in an in-plane helimagnet layer on triangular lattice that exchange couples to an underlayer with strong out-of-plane anisotropy. In the single helimagnet layer with in-plane anisotropy (K), the formation of labyrinthlike domains with local spin spirals, instead of parallel stripes, is favored, and these domains rapidly
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Simultaneous Zeeman deceleration of polyatomic free radical with lithium atoms Front Phys. (IF 2.502) Pub Date : 2020-10-15 Yang Liu, Le Luo
Chemistry in the ultracold regime enables fully quantum-controlled interactions between atoms and molecules, leading to the discovery of the hidden mechanisms in chemical reactions which are usually curtained by thermal averaging in the high temperature. Recently a couple of diatomic molecules have been cooled to ultracold regime based on laser cooling techniques, but the chemistry associated with
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Nearby source interpretation of differences among light and medium composition spectra in cosmic rays Front Phys. (IF 2.502) Pub Date : 2020-10-13 Qiang Yuan, Bing-Qiang Qiao, Yi-Qing Guo, Yi-Zhong Fan, Xiao-Jun Bi
Recently the AMS-02 reported the precise measurements of the energy spectra of medium-mass compositions (Neon, Magnesium, Silicon) of primary cosmic rays, which reveal different properties from those of light compositions (Helium, Carbon, Oxygen). Here we propose a nearby source scenario, together with the background source contribution, to explain the newly measured spectra of cosmic ray Ne, Mg, Si
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Research progress of rubrene as an excellent multifunctional organic semiconductor Front Phys. (IF 2.502) Pub Date : 2020-10-13 Si Liu, Hongnan Wu, Xiaotao Zhang, Wenping Hu
Rubrene, a superstar in organic semiconductors, has achieved unprecedented achievements in the application of electronic devices, and research based on its various photoelectric properties is still in progress. In this review, we introduced the preparation of rubrene crystal, summarized the applications in organic optoelectronic devices with the latest research achievements based on rubrene semiconductors
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Local probe of the interlayer coupling strength of few-layers SnSe by contact-resonance atomic force microscopy Front Phys. (IF 2.502) Pub Date : 2020-10-08 Zhi-Yue Zheng, Yu-Hao Pan, Teng-Fei Pei, Rui Xu, Kun-Qi Xu, Le Lei, Sabir Hussain, Xiao-Jun Liu, Li-Hong Bao, Hong-Jun Gao, Wei Ji, Zhi-Hai Cheng
The interlayer bonding in two-dimensional (2D) materials is particularly important because it is not only related to their physical and chemical stability but also affects their mechanical, thermal, electronic, optical, and other properties. To address this issue, we report the direct characterization of the interlayer bonding in 2D SnSe using contact-resonance atomic force microscopy (CR-AFM) in this
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Theoretical investigation of CoTa 2 O 6 /graphene heterojunctions for oxygen evolution reaction Front Phys. (IF 2.502) Pub Date : 2020-10-07 Qinye Li, Siyao Qiu, Baohua Jia
Water electrolysis is to split water into hydrogen and oxygen using electricity as the driving force. To obtain low-cost hydrogen in a large scale, it is critical to develop electrocatalysts based on earth abundant elements with a high efficiency. This computational work started with Cobalt on CoTa2O6 surface as the active site, CoTa2O6/Graphene heterojunctions have been explored as potential oxygen
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Self-organized criticality in multi-pulse gamma-ray bursts Front Phys. (IF 2.502) Pub Date : 2020-10-07 Fen Lyu, Ya-Ping Li, Shu-Jin Hou, Jun-Jie Wei, Jin-Jun Geng, Xue-Feng Wu
The variability in multi-pulse gamma-ray bursts (GRBs) may help to reveal the mechanism of underlying processes from the central engine. To investigate whether the self-organized criticality (SOC) phenomena exist in the prompt phase of GRBs, we statistically study the properties of GRBs with more than 3 pulses in each burst by fitting the distributions of several observed physical variables with a
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Giant enhancement of photoluminescence emission in monolayer WS 2 by femtosecond laser irradiation Front Phys. (IF 2.502) Pub Date : 2020-10-07 Cheng-Bing Qin, Xi-Long Liang, Shuang-Ping Han, Guo-Feng Zhang, Rui-Yun Chen, Jian-Yong Hu, Lian-Tuan Xiao, Suo-Tang Jia
Monolayer transition metal dichalcogenides have emerged as promising materials for optoelectronic and nanophotonic devices. However, the low photoluminescence (PL) quantum yield (QY) hinders their various potential applications. Here we engineer and enhance the PL intensity of monolayer WS2 by femtosecond laser irradiation. More than two orders of magnitude enhancement of PL intensity as compared to
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Isotropic or anisotropic screening in black phosphorous: Can doping tip the balance? Front Phys. (IF 2.502) Pub Date : 2020-10-02 Zhi-Min Liu, Ye Yang, Yue-Shao Zheng, Qin-Jun Chen, Ye-Xin Feng
Black phosphorus (BP), a layered van der Waals (vdW) crystal, has unique in-plane band anisotropy and many resulting anisotropy properties such as the effective mass, electron mobility, optical absorption, thermal conductivity and plasmonic dispersion. However, whether anisotropic or isotropic charge screening exist in BP remains a controversial issue. Based on first-principles calculations, we study
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Ground state cooling of magnomechanical resonator in $${\cal P}{\cal T}$$ P T -symmetric cavity magnomechanical system at room temperature Front Phys. (IF 2.502) Pub Date : 2020-10-02 Zhi-Xin Yang, Liang Wang, Yu-Mu Liu, Dong-Yang Wang, Cheng-Hua Bai, Shou Zhang, Hong-Fu Wang
We propose to realize the ground state cooling of magnomechanical resonator in a parity-time (\({\cal P}{\cal T}\))-symmetric cavity magnomechanical system composed of a loss ferromagnetic sphere and a gain microwave cavity. In the scheme, the magnomechanical resonator can be cooled close to its ground state via the magnomechanical interaction, and it is found that the cooling effect in \({\cal P}{\cal
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Van der Waals layered ferroelectric CuInP 2 S 6 : Physical properties and device applications Front Phys. (IF 2.502) Pub Date : 2020-09-30 Shuang Zhou, Lu You, Hailin Zhou, Yong Pu, Zhigang Gui, Junling Wang
Copper indium thiophosphate, CuInP2S6, has attracted much attention in recent years due to its van der Waals layered structure and robust ferroelectricity at room temperature. In this review, we aim to give an overview of the various properties of CuInP2S6, covering structural, ferroelectric, dielectric, piezoelectric and transport properties, as well as its potential applications. We also highlight
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Tuning band alignment and optical properties of 2D van der Waals heterostructure via ferroelectric polarization switching Front Phys. (IF 2.502) Pub Date : 2020-09-16 Dimuthu Wijethunge, Lei Zhang, Cheng Tang, Aijun Du
Favourable band alignment and excellent visible light response are vital for photochemical water splitting. In this work, we have theoretically investigated how ferroelectric polarization and its reversibility in direction can be utilized to modulate the band alignment and optical absorption properties. For this objective, 2D van der Waals heterostructures (HTSs) are constructed by interfacing monolayer
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Talbot effect in nonparaxial self-accelerating beams with electromagnetically induced transparency Front Phys. (IF 2.502) Pub Date : 2020-09-05 Jing-Min Ru; Zhen-Kun Wu; Ya-Gang Zhang; Feng Wen; Yu-Zong Gu
In this study, we report on the fractional Talbot effect of nonparaxial self-accelerating beams in a multilevel electromagnetically induced transparency (EIT) atomic configuration, which, to the best of our knowledge, is the first study on this subject. The Talbot effect originates from superposed eigenmodes of the Helmholtz equation and forms in the EIT window in the presence of both linear and cubic
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Tuning the electronic properties of hydrogen passivated C 3 N nanoribbons through van der Waals stacking Front Phys. (IF 2.502) Pub Date : 2020-09-05 Jia Liu; Xian Liao; Jiayu Liang; Mingchao Wang; Qinghong Yuan
The two-dimensional (2D) C3N has emerged as a material with promising applications in high performance device owing to its intrinsic bandgap and tunable electronic properties. Although there are several reports about the bandgap tuning of C3N via stacking or forming nanoribbon, bandgap modulation of bilayer C3N nanoribbons (C3NNRs) with various edge structures is still far from well understood. Here
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Enhancing hydrogen evolution of MoS 2 basal planes by combining single-boron catalyst and compressive strain Front Phys. (IF 2.502) Pub Date : 2020-08-17 Zhitao Cui; Wei Du; Chengwei Xiao; Qiaohong Li; Rongjian Sa; Chenghua Sun; Zuju Ma
MoS2 is a promising candidate for hydrogen evolution reaction (HER), while its active sites are mainly distributed on the edge sites rather than the basal plane sites. Herein, a strategy to overcome the inertness of the MoS2 basal surface and achieve high HER activity by combining single-boron catalyst and compressive strain was reported through density functional theory (DFT) computations. The ab
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Experimental review of the Υ(1 S , 2 S , 3 S ) physics at e + e − colliders and the LHC Front Phys. (IF 2.502) Pub Date : 2020-08-08 Sen Jia; Xingyu Zhou; Chengping Shen
The three lowest-lying Υ states, i.e., Υ(1S), Υ(2S), and Υ(3S), composed of b\(\overline b \) pairs and below the B\(\overline B \) threshold, provide a ood platform for the researches of hadronic physics and physics beyond the Standard Model. They can be produced directly in e+e− colliding experiments, such as CLEO, Babar, and Belle, with low continuum backgrounds. In these experiments, many measurements
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Stanene: A good platform for topological insulator and topological superconductor Front Phys. (IF 2.502) Pub Date : 2020-07-23 Chen-Xiao Zhao; Jin-Feng Jia
Two dimensional (2D) topological insulators (TIs) and topological superconductors (TSCs) have been intensively studied for recent years due to their great potential for dissipationless electron transportation and fault-tolerant quantum computing, respectively. Here we focus on stanene, the tin analogue of graphene, to give a brief review of their development as a candidate for both 2D TI and TSC. Stanene
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Observation of pseudogap in SnSe 2 atomic layers grown on graphite Front Phys. (IF 2.502) Pub Date : 2020-07-21 Ya-Hui Mao; Huan Shan; Jin-Rong Wu; Ze-Jun Li; Chang-Zheng Wu; Xiao-Fang Zhai; Ai-Di Zhao; Bing Wang
Superconducting metal dichalcogenides (MDCs) present several similarities to the other layered superconductors like cuprates. The superconductivity in atomically thin MDCs has been demonstrated by recent experiments, however, the investigation of the superconductivity intertwined with other orders are scarce. Investigating the pseudogap in atomic layers of MDCs may help to understand the superconducting
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Accelerating inverse crystal structure prediction by machine learning: A case study of carbon allotropes Front Phys. (IF 2.502) Pub Date : 2020-07-15 Wen Tong; Qun Wei; Hai-Yan Yan; Mei-Guang Zhang; Xuan-Min Zhu
Based on structure prediction method, the machine learning method is used instead of the density functional theory (DFT) method to predict the material properties, thereby accelerating the material search process. In this paper, we established a data set of carbon materials by high-throughput calculation with available carbon structures obtained from the Samara Carbon Allotrope Database. We then trained
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N -cluster correlations in four- and five-dimensional percolation Front Phys. (IF 2.502) Pub Date : 2020-07-11 Xiao-Jun Tan; You-Jin Deng; Jesper Lykke Jacobsen
We study N-cluster correlation functions in four- and five-dimensional (4D and 5D) bond percolation by extensive Monte Carlo simulation. We reformulate the transfer Monte Carlo algorithm for percolation [Phys. Rev. E72, 016126 (2005)] using the disjoint-set data structure, and simulate a cylindrical geometry Ld−1 × ∞, with the linear size up to L = 512 for 4D and 128 for 5D. We determine with a high
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Nonadiabatic geometric quantum computation with optimal control on superconducting circuits Front Phys. (IF 2.502) Pub Date : 2020-07-11 Jing Xu; Sai Li; Tao Chen; Zheng-Yuan Xue
Quantum gates, which are the essential building blocks of quantum computers, are very fragile. Thus, to realize robust quantum gates with high fidelity is the ultimate goal of quantum manipulation. Here, we propose a nonadiabatic geometric quantum computation scheme on superconducting circuits to engineer arbitrary quantum gates, which share both the robust merit of geometric phases and the capacity
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Entangled chimeras in nonlocally coupled bicomponent phase oscillators: From synchronous to asynchronous chimeras Front Phys. (IF 2.502) Pub Date : 2020-07-11 Qiong-Lin Dai; Xiao-Xuan Liu; Kai Yang; Hong-Yan Cheng; Hai-Hong Li; Fagen Xie; Jun-Zhong Yang
Chimera states, a symmetry-breaking spatiotemporal pattern in nonlocally coupled identical dynamical units, have been identified in various systems and generalized to coupled nonidentical oscillators. It has been shown that strong heterogeneity in the frequencies of nonidentical oscillators might be harmful to chimera states. In this work, we consider a ring of nonlocally coupled bicomponent phase
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Spin-1 pyrochlore antiferromagnets: Theory, model, and materials’ survey Front Phys. (IF 2.502) Pub Date : 2020-07-11 Yong-Hao Gao; Xu-Ping Yao; Fei-Ye Li; Gang Chen
Pyrochlore magnets can be a unique platform to demonstrate numerous important concepts and applications of frustrated magnetic physics in modern condensed matter physics. Most works on pyrochlore magnets deal with the interacting spin-1/2 local moments, while much less works have studied the spin-1 systems. We here review the physics with interacting spin-1 local moments on the pyrochlore lattice to
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Laser ablation assisted spark induced breakdown spectroscopy and its application Front Phys. (IF 2.502) Pub Date : 2020-07-07 Wei-Dong Zhou; Yu-Hui Guo; Ran-Ran Zhang
Recently, laser ablation assisted spark induced breakdown spectroscopy (LA-SIBS) has been growing rapidly and continue to be extended to a broad range of materials analysis. Characterized by employing a specifically designed high voltage and pulse discharge circuit to generate a spark and used to enhance plasma emission produced by laser ablation, allows direct analysis of materials without prior sample
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Multi-variable special polynomials using an operator ordering method Front Phys. (IF 2.502) Pub Date : 2020-07-07 Xiang-Guo Meng; Kai-Cai Li; Ji-Suo Wang; Zhen-Shan Yang; Xiao-Yan Zhang; Zhen-Tao Zhang; Bao-Long Liang
Using an operator ordering method for some commutative superposition operators, we introduce two new multi-variable special polynomials and their generating functions, and present some new operator identities and integral formulas involving the two special polynomials. Instead of calculating complicated partial differential, we use the special polynomials and their generating functions to concisely
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A quantitative assessment of communicating extra-terrestrial intelligent civilizations in the galaxy and the case of FRB-like signals Front Phys. (IF 2.502) Pub Date : 2020-07-06 Bing Zhang
A formula is proposed to quantitatively estimate the signal emission rate of Communicating Extra-Terrestrial Intelligent civilizations (CETIs) in the Galaxy. I suggest that one possible type of CETI signal would be brief radio bursts similar to fast radio bursts (FRBs). A dedicated search for FRB-like artificial signals in the Galaxy for decades may pose a meaningful upper limit on the emission rate
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Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings Front Phys. (IF 2.502) Pub Date : 2020-06-10 Yang-Yang Fu; Jia-Qi Tao; Ai-Ling Song; You-Wen Liu; Ya-Dong Xu
In this work, we designed and studied a feasible dual-layer binary metagrating, which can realize controllable asymmetric transmission and beam splitting with nearly perfect performance. Owing to ingenious geometry configuration, only one meta-atom is required to design for the metagrating system. By simply controlling air gap between dual-layer metagratings, high-efficiency beam splitting can be well
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