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  • Three-Terminal Thermionic Heat Engine Based on Semiconductor Heterostructures
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Yun-Yun Yang, Shuai Xu and Ji-Zhou He

    We propose a model for three-terminal thermionic heat engines based on semiconductor heterostructures. According to electron transport theory, we drive the formulas for the charge current and energy current flowing from the electron reservoir and we then obtain the power output and efficiency in the linear and nonlinear regimes. Furthermore, we analyze the performance characteristic of the thermionic

    更新日期:2020-12-24
  • HfX 2 (X = Cl, Br, I) Monolayer and Type II Heterostructures with Promising Photovoltaic Characteristics
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Xingyong Huang, Liujiang Zhou, Luo Yan, You Wang, Wei Zhang, Xiumin Xie, Qiang Xu and Hai-Zhi Song

    Two-dimensional (2D) materials and their corresponding van der Waals (vdW) heterostructures are considered as promising candidates for highly efficient solar cell applications. A series of 2D HfX 2 (X = Cl, Br, I) monolayers are proposed, via first-principle calculations. The vibrational phonon spectra and molecular dynamics simulation results indicate that HfX 2 monolayers possess dynamical and thermodynamical

    更新日期:2020-12-24
  • Active Thermal Wave Cloak
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Liu-Jun Xu and Ji-Ping Huang

    Active metamaterials have shown huge advantages to control electromagnetic and acoustic waves. However, how to use active metamaterials to control thermal waves has not been explored, though thermal waves are significant in various fields. To address the problem, here we report an active scheme for thermal wave cloaks. The thermal waves are based on conduction and convection, which are dominated by

    更新日期:2020-12-24
  • Generation and Tunable Focal Shift of the Hybridly Polarized Vector Optical Fields with Parabolic Symmetry
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Xu-Zhen Gao, Meng-Shuai Wang, Jia-Hao Zhao, Peng-Cheng Zhao, Xia Zhang, Yue Pan, Yongnan Li, Chenghou Tu and Hui-Tian Wang

    Based on a parabolic coordinate system, we theoretically design and experimentally generate hybridly polarized vector optical fields with parabolic symmetry of the first and second kinds, which can further enrich the family of vector optical fields. The wavefront of this new-kind vector optical field contains circular, elliptic and linear polarizations, and the polarizations can keep the same or change

    更新日期:2020-12-24
  • Inversion/Mirror Symmetry-Protected Dirac Cones in Distorted Ruby Lattices
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Lei Sun, Xiaoming Zhang, Han Gao, Jian Liu, Feng Liu and Mingwen Zhao

    The exotic electronic band structures of Ruby and Star lattices, characterized by Dirac cone and nontrivial topology, offer a unique platform for the study of two-dimensional (2D) Dirac materials. In general, an ideal isotropic Dirac cone is protected by time reversal symmetry and inversion, so that its robustness against lattice distortion is not only of fundamental interest but also crucial to practical

    更新日期:2020-12-24
  • Gap Structure of 12442-Type KCa 2 (Fe 1− x Co x ) 4 As 4 F 2 ( x = 0, 0.1) Revealed by Temperature Dependence of Lower Critical Field
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Jianan Chu, Teng Wang, Han Zhang, Yixin Liu, Jiaxin Feng, Zhuojun Li, Da Jiang, Gang Mu, Zengfeng Di and Xiaoming Xie

    We report an in-depth investigation on the out-of-plane lower critical field H c1 of the KCa 2 (Fe 1− x Co x ) 4 As 4 F 2 (12442-type, x = 0, 0.1). The multi-gap feature is revealed by the kink in the temperature-dependent H c1 ( T ) curve for the two samples with different doping levels. Based on a simplified two-gap model, the magnitudes of the two gaps are determined to be Δ 1 = 1.2 meV and Δ 2

    更新日期:2020-12-24
  • Trion-Facilitated Dexter-Type Energy Transfer in a Cluster of Single Perovskite CsPbBr 3 Nanocrystals
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Zengle Cao, Fengrui Hu, Zaiqin Man, Chunfeng Zhang, Weihua Zhang, Xiaoyong Wang and Min Xiao

    Semiconductor colloidal nanocrystals (NCs) can interact with each other to profoundly influence the charge transfer, transport and extraction processes after they have been assembled into a high-density film for optoelectronic device applications. These interactions normally occur among several nearby single colloidal NCs, which should be effectively separated from their surroundings to remove the

    更新日期:2020-12-24
  • Long-Range Interaction Enhanced Adiabatic Quantum Computers
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Anqi Shi, Haoyu Guan, Jun Zhang and Wenxian Zhang

    A quantum computer is not necessarily alone, e.g., thousands and millions of quantum computers are simultaneously working together for adiabatic quantum computers based on nuclear spins. Long-range interaction is inevitable between these nuclear spin qubits. Here we investigate the effect of long-range dipolar interaction between different adiabatic quantum computers. Our analytical and numerical results

    更新日期:2020-12-24
  • Extreme Ultraviolet Frequency Comb with More than 100 μW Average Power below 100nm
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Jin Zhang, Lin-Qiang Hua, Zhong Chen, Mu-Feng Zhu, Cheng Gong and Xiao-Jun Liu

    Extreme ultraviolet (XUV) frequency comb is a powerful tool in precision measurement. It also brings many new opportunities to the field of strong field physics since high harmonic generation related phenomena can be studied with high repetition rate. We demonstrate the generation of an XUV frequency comb with the aid of intra-cavity high harmonic generation process. The setup is driven by a high power

    更新日期:2020-12-24
  • Hermite Non-Uniformly Correlated Array Beams and Its Propagation Properties
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Xue-Chun Zhao, Lei Zhang, Rong Lin, Shu-Qin Lin, Xin-Lei Zhu, Yang-Jian Cai and Jia-Yi Yu

    We study the evolution of spectral intensity and degree of coherence of a new class of partially coherent beams, Hermite non-uniformly correlated array beams, in free space and in turbulence, based on the extended Huygens–Fresnel integral. Such beams possess controllable rectangular grid distributions due to multi-self-focusing propagation property. Furthermore, it is demonstrated that adjusting the

    更新日期:2020-12-24
  • Fano Effect and Spin-Polarized Transport in a Triple-Quantum-Dot Interferometer Attached to Two Ferromagnetic Leads
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Jiyuan Bai, Kongfa Chen, Pengyu Ren, Jianghua Li, Zelong He and Li Li

    We report the conductance and average current through a triple-quantum-dot interferometer coupled with two ferromagnetic leads using the nonequilibrium Green’s function. The results show that the interference between the resonant process and the non-resonant process leads to the formation of Fano resonance. More Fano resonances can be observed by applying a time-dependent external field. As a Zeeman

    更新日期:2020-12-24
  • Low Voltage Reversible Manipulation of Ferromagnetic Resonance Response in CoFeB/HfO 2 Heterostructures
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Yangping Wang, Hongyan Zhou, Yibing Zhao, Fufu Liu and Changjun Jiang

    We report that the ferromagnetic resonance (FMR) response of the CoFeB/HfO 2 heterostructures is stabilized and reversibly manipulated by ionic gel. Ionic gel with excellent flexibility is used as a medium to form an electric field. When a 4 V gate voltage is applied, the resonance field H r and peak-to-peak linewidth Δ H pp at different angles are regulated. When θ = 20°, the H r is regulated up to

    更新日期:2020-12-24
  • Impressions of the Continuum Bound State Problem in QCD
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Si-Xue Qin and C. D. Roberts

    Modern and anticipated facilities will deliver data that promises to reveal the innermost workings of quantum chromodynamics (QCD). In order to fulfill that promise, phenomenology and theory must reach a new level, limiting and overcoming model-dependence, so that clean lines can be drawn to connect the data with QCD itself. Progress in that direction, made using continuum methods for the hadron bound-state

    更新日期:2020-12-24
  • Accuracy of Machine Learning Potential for Predictions of Multiple-Target Physical Properties
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Yulou Ouyang, Zhongwei Zhang, Cuiqian Yu, Jia He, Gang Yan and Jie Chen

    The accurate and rapid prediction of materials’ physical properties, such as thermal transport and mechanical properties, are of particular importance for potential applications of featuring novel materials. We demonstrate, using graphene as an example, how machine learning potential, combined with the Boltzmann transport equation and molecular dynamics simulations, can simultaneously provide an accurate

    更新日期:2020-12-24
  • Observation of Cesium ( nD 5/2 +6 S 1/2 ) Ultralong-Range Rydberg-Ground Molecules
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Su-Ying Bai, Jing-Xu Bai, Xiao-Xuan Han, Yue-Chun Jiao, Jian-Ming Zhao and Suo-Tang Jia

    Ultralong-range Cs 2 Rydberg-ground molecules ( nD 5/2 + 6 S 1/2 F ) (33 ≤ n ≤ 39, F = 3 or 4) are investigated by a two-photon photo-association spectroscopy of an ultracold Cs gas. Two vibrational ground molecular spectra of triplet 3 Σ and hyperfine mixed singlet-triplet 1,3 Σ molecular states and their corresponding binding energies are attained. The experimental observations are simulated by an

    更新日期:2020-12-24
  • Molecular Opacity Calculations for Lithium Hydride at Low Temperature
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-12-24
    Gui-Ying Liang, Yi-Geng Peng, Rui Li, Yong Wu and Jian-Guo Wang

    The opacities of the lithium hydride molecule are calculated for temperatures of 300 K, 1000 K, 1500 K, and 2000 K, at a pressure of 10 atm, in which the contributions from the five low-lying electronic states are considered. The ab initio multi-reference single and double excitation configuration interaction (MRDCI) method is applied to compute the potential energy curves (PECs) of the 7 LiH, including

    更新日期:2020-12-24
  • A Fully Symmetrical Quantum Key Distribution System Capable of Preparing and Measuring Quantum States
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Tianqi Dou, Jipeng Wang, Zhenhua Li, Wenxiu Qu, Shunyu Yang, Zhongqi Sun, Fen Zhou, Yanxin Han, Yuqing Huang and Haiqiang Ma

    We propose a fully symmetrical QKD system that enables quantum states to be prepared and measured simultaneously without compromising system performance. Over a 25.6 km fiber channel, we demonstrate point-to-point QKD operations with asymmetric Mach–Zehnder interferometer modules. Two interference visibilities of above 99% indicate that the proposed system has excellent stability. Consequently, the

    更新日期:2020-12-01
  • Shear-Banding Evolution Dynamics during High Temperature Compression of Martensitic Ti-6Al-4V Alloy
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Xue-Hua Zhang, Rong Li, Yong-Qing Zhao and Wei-Dong Zeng

    The isothermal compression dynamics of ternary Ti-6Al-4V alloy with initial martensitic structures were investigated in the high temperature range 1083–1173 K and moderate strain rate regime 0.01–10 s −1 . Shear banding was found to still dominate the deformation mechanism of this process, despite its nonadiabatic feature. The constitutive equation was derived with the aid of Zener–Hollomon parameter

    更新日期:2020-12-01
  • Tuning the Water Desalination Performance of Graphenic Layered Nanomaterials by Element Doping and Inter-Layer Spacing
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Fuxin Wang, Chao Zhang, Yanmei Yang, Yuanyuan Qu, Yong-Qiang Li, Baoyuan Man and Weifeng Li

    Through atomic molecular dynamics simulations, we investigate the performance of two graphenic materials, boron (BC 3 ) and nitrogen doped graphene (C 3 N), for seawater desalination and salt rejection, and take pristine graphene as a control. Effects of inter-layer separation have been explored. When water is filtered along the transverse directions of three-layered nanomaterials, the optimal inter-layer

    更新日期:2020-12-01
  • Rapid Measurement and Control of Nitrogen-Vacancy Center-Axial Orientation in Diamond Particles
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Guobin Chen, Yang Hui, Junci Sun, Wenhao He and Guanxiang Du

    Determination and control of nitrogen-vacancy (NV) centers play an important role in sensing the vector field by using their quantum information. To measure orientation of NV centers in a diamond particle attached to a tapered fiber rapidly, we propose a new method to establish the direction cosine matrix between the lab frame and the NV body frame. In this method, only four groups of the ODMR spectrum

    更新日期:2020-12-01
  • Generation of Intense Sub-10 fs Pulses at 385nm
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Fan Xiao, Xiaohui Fan, Li Wang, Dongwen Zhang, Jianhua Wu, Xiaowei Wang and Zengxiu Zhao

    We demonstrated the generation and characterization of 9.7 fs, 180 μ J pulses centered at 385 nm via the frequency doubling of few-cycle near-infrared pulses. Both moderate conversion efficiency (9.5%) and broad phase matching bandwidth (20 nm) were achieved by shaping the spectra of the fundamental pulses. The strong intensity dependence of second-order harmonic generation and well controlled material

    更新日期:2020-12-01
  • Semi-Ellipsoid Nanoarray for Angle-Independent Plasmonic Color Printing
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Jiancai Xue, Limin Lin, Zhang-Kai Zhou and Xue-Hua Wang

    Employing a silver nano semi-ellipsoid nanoarray with high symmetry into applications in plasmonic color printing, we fulfill printing images with colors independent of observing angles. Also, by decreasing the period of a nano semi-ellipsoid array into deep-subwavelength scales, we obtain high reflectivity over 50%, promising high efficiency for imaging generations. A facile technique based on the

    更新日期:2020-12-01
  • Universality of the Dynamic Characteristic Relationship of Electron Correlation in the Two-Photon Double Ionization Process of a Helium-Like System
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Fei Li, Yu-Jun Yang, Jing Chen, Xiao-Jun Liu, Zhi-Yi Wei and Bing-Bing Wang

    Universality of the dynamic characteristic relationship between the characteristic time t c and the two-electron Coulomb interaction energy ##IMG## [http://ej.iop.org/images/0256-307X/37/11/113201/cpl_37_11_113201_ieqn1.gif] {${\bar{V}}_{12}$} of the ground state in the two-photon double ionization process is investigated via changing the parameters of the two-electron atomic system and the corresponding

    更新日期:2020-12-01
  • Critical Temperature of Deconfinement in a Constrained Space Using a Bag Model at Vanishing Baryon Density
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Zonghou Han, Baoyi Chen and Yunpeng Liu

    The geometry of fireballs in relativistic heavy ion collisions is approximated by a static box, which is infinite in two directions while finite in the other direction. The critical temperature of deconfinement phase transition is calculated explicitly in the MIT bag model at vanishing baryon density. It is found that the critical temperature shifts to a value higher than that in an unconstrained space

    更新日期:2020-12-01
  • Possible Candidates for Chirality in the Odd-Odd As Isotopes
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    Chen Liu, Shouyu Wang, Bin Qi and Hui Jia

    The deformations and the corresponding configurations of the odd-odd As isotopes are investigated using the adiabatic and configuration-fixed constrained triaxial relativistic mean field (RMF) theory. Energy minima with triaxial deformations and high- j particle-hole configurations are obtained in 72,74,76,78,80 As, where the chiral doublet bands are possible to appear. The existence of multiple chiral

    更新日期:2020-12-01
  • Mutual Restriction between Concurrence and Intrinsic Concurrence for Arbitrary Two-Qubit States
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-25
    A-Long Zhou, Dong Wang, Xiao-Gang Fan, Fei Ming and Liu Ye

    Concurrence is viewed as the most commonly approach for quantifying entanglement of two-qubit states, while intrinsic concurrence contains concurrence of four pure states consisting of a special pure state ensemble concerning an arbitrary two-qubit state. Thus, a natural question arises: Whether there is a specified relation between them. We firstly examine the relation between concurrence and intrinsic

    更新日期:2020-12-01
  • Exciton Vortices in Two-Dimensional Hybrid Perovskite Monolayers
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-11-20
    Yingda Chen, Dong Zhang and Kai Chang

    We study theoretically the exciton Bose–Einstein condensation and exciton vortices in a two-dimensional (2D) perovskite (PEA) 2 PbI 4 monolayer. Combining the first-principles calculations and the Keldysh model, the exciton binding energy of in a (PEA) 2 PbI 4 monolayer can approach hundreds of meV, which make it possible to observe the excitonic effect at room temperature. Due to the large exciton

    更新日期:2020-11-23
  • Reaction Rate Weighted Multilayer Nuclear Reaction Network
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-21
    Huan-Ling Liu, Ding-Ding Han, Peng Ji and Yu-Gang Ma

    Nuclear reaction rate λ is a significant factor in processes of nucleosyntheses. A multi-layer directed-weighted nuclear reaction network, in which the reaction rate is taken as the weight, and neutron, proton, 4 He and the remainder nuclei as the criteria for different reaction layers, is for the first time built based on all thermonuclear reactions in the JINA REACLIB database. Our results show that

    更新日期:2020-10-30
  • Perovskite Termination-Dependent Charge Transport Behaviors of the CsPbI 3 /Black Phosphorus van der Waals Heterostructure
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Yong-Hua Cao, Jin-Tao Bai and Hong-Jian Feng

    Fundamental understanding of interfacial charge behaviors is of great significance for the optoelectronic and photovoltaic applications. However, the crucial roles of perovskite terminations in charge transport processes have not been completely clear. We investigate the charge transfer behaviors of the CsPbI 3 /black phosphorus (BP) van der Waals heterostructure by using the density functional theory

    更新日期:2020-10-16
  • Effect of B-Site Ordering on the Magnetic Order in Multifunctional La 2 NiMnO 6 Double Perovskite
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Dexin Yang, Rui Jiang, Yaohua Zhang, Hui Zhang, Senlin Lei, Tao Yang, Xiaoshi Hu, Shuai Huang, Jingyuan Ge, Kunpeng Su, Haiou Wang and Dexuan Huo

    To obtain various Ni/Mn orderings, we use a low-temperature synthesized method to modulate the Ni/Mn ordering of the ferromagnetic-ferroelastic La 2 NiMnO 6 compound, and the Ni/Mn ordering is estimated by the low-temperature saturation magnetism. The microstructures, crystal structures and magnetic properties are investigated, and the Landau theory are used to describe the form and magnitude of the

    更新日期:2020-10-16
  • Antimony Selenide Thin Film Solar Cells with an Electron Transport Layer of Alq 3
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Wen-Jian Shi, Ze-Ming Kan, Chuan-Hui Cheng, Wen-Hui Li, Hang-Qi Song, Meng Li, Dong-Qi Yu, Xiu-Yun Du, Wei-Feng Liu, Sheng-Ye Jin and Shu-Lin Cong

    We fabricated Sb 2 Se 3 thin film solar cells using tris(8-hydroxy-quinolinato) aluminum (Alq 3 ) as an electron transport layer by vacuum thermal evaporation. Another small organic molecule of N,N’-bis(naphthalen-1-yl)-N,N’-bis(phenyl)benzidine (NPB) was used as a hole transport layer. We took ITO/NPB/Sb 2 Se 3 /Alq 3 /Al as the device architecture. An open circuit voltage ( V oc ) of 0.37 V, a short

    更新日期:2020-10-16
  • Scrolled Production of Large-Scale Continuous Graphene on Copper Foils
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Zhibin Zhang, Jiajie Qi, Mengze Zhao, Nianze Shang, Yang Cheng, Ruixi Qiao, Zhihong Zhang, Mingchao Ding, Xingguang Li, Kehai Liu, Xiaozhi Xu, Kaihui Liu, Can Liu and Muhong Wu

    We report an efficient and economical way for mass production of large-scale graphene films with high quality and uniformity. By using the designed scrolled copper-graphite structure, a continuous graphene film with typical area of 200 × 39 cm 2 could be obtained in 15 min, and the production rate of the graphene film and space utilization rate of the CVD reactor can reach 520 cm 2 ⋅min −1 and 0.38

    更新日期:2020-10-16
  • Field-Induced Metal–Insulator Transition in β -EuP 3
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Guangqiang Wang, Guoqing Chang, Huibin Zhou, Wenlong Ma, Hsin Lin, M. Zahid Hasan, Su-Yang Xu and Shuang Jia

    Metal–insulator transition (MIT) is one of the most conspicuous phenomena in correlated electron systems. However such a transition has rarely been induced by an external magnetic field as the field scale is normally too small compared with the charge gap. We present the observation of a magnetic-field-driven MIT in a magnetic semiconductor β -EuP 3 . Concomitantly, we find a colossal magnetoresistance

    更新日期:2020-10-16
  • Superconductivity of Lanthanum Superhydride Investigated Using the Standard Four-Probe Configuration under High Pressures
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Fang Hong, Liuxiang Yang, Pengfei Shan, Pengtao Yang, Ziyi Liu, Jianping Sun, Yunyu Yin, Xiaohui Yu, Jinguang Cheng and Zhongxian Zhao

    Recently, the theoretically predicted lanthanum superhydride, LaH 10 ± δ , with a clathrate-like structure was successfully synthesized and found to exhibit a record high superconducting transition temperature T c ≈ 250 K at ∼ 170 GPa, opening a new route for room-temperature superconductivity. However, since in situ experiments at megabar pressures are very challenging, few groups have reported the

    更新日期:2020-10-16
  • Tuning of the Magnetic Damping Parameter by Varying Cr Composition in Fe 1– x Cr x Alloy
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Mao Yang, Xianyang Lu, Bo Liu, Xuezhong Ruan, Junran Zhang, Xiaoqian Zhang, Dawei Huang, Jing Wu, Jun Du, Bo Liu, Hao Meng, Liang He and Yongbing Xu

    We investigate the magnetic damping parameter of Fe 1 – x Cr x thin films using the time-resolved magneto-optical Kerr effect technique. It is demonstrated that the overall effective damping parameter is enhanced with the increasing Cr concentration. The effective damping at high field α 0 is found to be significantly enhanced when increasing the Cr concentration with the α 0 = 0.159 in the Fe 45 Cr

    更新日期:2020-10-16
  • Quantum Oscillations and Electronic Structure in the Large-Chern-Number Topological Chiral Semimetal PtGa
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Sheng Xu, Liqin Zhou, Xiao-Yan Wang, Huan Wang, Jun-Fa Lin, Xiang-Yu Zeng, Peng Cheng, Hongming Weng and Tian-Long Xia

    We report the magnetoresistance (MR), de Haas-van Alphen (dHvA) oscillations and the electronic structures of single-crystal PtGa. The large unsaturated MR is observed with the magnetic field B ∥ [111]. Evident dHvA oscillations with the B ∥ [001] configuration are observed, from which twelve fundamental frequencies are extracted and the spin-orbit coupling (SOC) induced band splitting is revealed

    更新日期:2020-10-16
  • Structural Domain Imaging and Direct Determination of Crystallographic Orientation in Noncentrosymmetric Ca 3 Ru 2 O 7 Using Polarized Light Reflectance
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Guoxiong Tang, Libin Wen, Hui Xing, Wenjie Liu, Jin Peng, Yu Wang, Yupeng Li, Baijiang Lv, Yusen Yang, Chao Yao, Yueshen Wu, Hong Sun, Zhu-An Xu, Zhiqiang Mao and Ying Liu

    The noncentrosymmetricity of a prototypical correlated electron system Ca 3 Ru 2 O 7 renders extensive interest in the possible polar metallic state, along with multiple other closely competing interactions. However, the structural domain formation in this material often complicates the study of intrinsic material properties. It is crucial to fully characterize the structural domains for unrevealing

    更新日期:2020-10-16
  • Molecular Dynamics Simulations of the Interface between Porous and Fused Silica
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Ye Tian, Xiaodong Yuan, Dongxia Hu, Wanguo Zheng and Wei Han

    Molecular dynamics simulations are performed to gain insights into the structural and vibrational properties of interface between porous and fused silica. The Si–O bonds formed in the interface exhibit the same lengths as the bulk material, whereas the coordination defects in the interface are at an intermediate level as compared with the dense and porous structures. Clustered bonds are identified

    更新日期:2020-10-16
  • Diffraction-Limited Imaging with a Graphene Metalens
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Xueyan Li, Han Lin, Yuejin Zhao and Baohua Jia

    Planar graphene metalens has demonstrated advantages of ultrathin thickness (200 nm), high focusing resolution (343 nm) and efficiency (>32%) and robust mechanical strength and flexibility. However, diffraction-limited imaging with such a graphene metalens has not been realized, which holds the key to designing practical integrated imaging systems. In this work, the imaging rule for graphene metalenses

    更新日期:2020-10-16
  • Abundant Traveling Wave Structures of (1+1)-Dimensional Sawada-Kotera Equation: Few Cycle Solitons and Soliton Molecules
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Wei Wang, Ruoxia Yao and Senyue Lou

    Traveling wave solutions have been well studied for various nonlinear systems. However, for high order nonlinear physical models, there still exist various open problems. Here, travelling wave solutions to the well-known fifth-order nonlinear physical model, the Sawada–Kotera equation, are revisited. Abundant travelling wave structures including soliton molecules, soliton lattice, kink-antikink molecules

    更新日期:2020-10-16
  • Tunable Optical Bandpass Filter via a Microtip-Touched Tapered Optical Fiber
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Peng-Fei Zhang, Li-Jun Song, Chang-Lin Zou, Xin Wang, Chen-Xi Wang, Gang Li and Tian-Cai Zhang

    We demonstrate a tunable bandpass optical filter based on a tapered optical fiber (TOF) touched by a hemispherical microfiber tip (MFT). Other than the interference and selective material absorption effects, the filter relies on the controllable and wavelength-dependent mode–mode interactions in TOF. Experimentally, a large range of tunability is realized by controlling the position of the MFT in contact

    更新日期:2020-10-16
  • Active Learning Approach to Optimization of Experimental Control
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Yadong Wu, Zengming Meng, Kai Wen, Chengdong Mi, Jing Zhang and Hui Zhai

    We present a general machine learning based scheme to optimize experimental control. The method utilizes the neural network to learn the relation between the control parameters and the control goal, with which the optimal control parameters can be obtained. The main challenge of this approach is that the labeled data obtained from experiments are not abundant. The central idea of our scheme is to use

    更新日期:2020-10-16
  • Anomalous tqγ Couplings and Radiative B Meson Decays
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Ying Tan and Chong-Xing Yue

    Motivated by the recent ATLAS results in terms of the branching ratios Br ( t → qγ ), we consider the effects of the anomalous tqγ couplings on the radiative B meson decays ##IMG## [http://ej.iop.org/images/0256-307X/37/10/101301/cpl_37_10_101301_ieqn1.gif] {$\bar{B}\to {X}_{D}\gamma $} and B → Vγ with V being light vector mesons ρ , ω , ϕ and K * . Comparing with the corresponding experimental measured

    更新日期:2020-10-16
  • Chiral State Conversion in a Levitated Micromechanical Oscillator with In Situ Control of Parameter Loops
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Peiran Yin, Xiaohui Luo, Liang Zhang, Shaochun Lin, Tian Tian, Rui Li, Zizhe Wang, Changkui Duan, Pu Huang and Jiangfeng Du

    Physical systems with gain and loss can be described by a non-Hermitian Hamiltonian, which is degenerated at the exceptional points (EPs). Many new and unexpected features have been explored in the non-Hermitian systems with a great deal of recent interest. One of the most fascinating features is that chiral state conversion appears when one EP is encircled dynamically. Here, we propose an easy-controllable

    更新日期:2020-10-16
  • Magnetic Phase Diagram of Cu 4– x Zn x (OH) 6 FBr Studied by Neutron-Diffraction and μ SR Techniques
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Yuan Wei, Xiaoyan Ma, Zili Feng, Devashibhai Adroja, Adrian Hillier, Pabitra Biswas, Anatoliy Senyshyn, Andreas Hoser, Jia-Wei Mei, Zi Yang Meng, Huiqian Luo, Youguo Shi and Shiliang Li

    We systematically investigate the magnetic properties of Cu 4 – x Zn x (OH) 6 FBr using the neutron diffraction and muon spin rotation and relaxation ( μ SR) techniques. Neutron-diffraction measurements suggest that the long-range magnetic order and the orthorhombic nuclear structure in the x = 0 sample can persist up to x = 0.23 and 0.43, respectively. The temperature dependence of the zero-field

    更新日期:2020-10-16
  • Fe 2 Ga 2 S 5 as a 2D Antiferromagnetic Semiconductor
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Chunyan Liao, Yahui Jin, Wei Zhang, Ziming Zhu and Mingxing Chen

    We theoretically investigate physical properties of two-dimensional (2D) Fe 2 Ga 2 S 5 by employing first-principles calculations. It is found that it is an antiferromagnet with zigzag magnetic configuration orienting in the in-plane direction, with Néel temperatures around 160 K. The band structure of the ground state shows that it is a semiconductor with the indirect band gap of about 0.9 eV, which

    更新日期:2020-10-16
  • Coupling Stacking Orders with Interlayer Magnetism in Bilayer H-VSe 2
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-14
    Aolin Li, Wenzhe Zhou, Jiangling Pan, Qinglin Xia, Mengqiu Long and Fangping Ouyang

    Stacking-dependent magnetism in van der Waals materials has caught intense interests. Based on the first principle calculations, we investigate the coupling between stacking orders and interlayer magnetic orders in bilayer H-VSe 2 . It is found that there are two stable stacking orders in bilayer H-VSe 2 , named AB-stacking and A′B-stacking. Under standard DFT framework, the A′B-stacking prefers the

    更新日期:2020-10-16
  • Enhanced Ferromagnetism of CrI 3 Bilayer by Self-Intercalation
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-11
    Yu Guo, Nanshu Liu, Yanyan Zhao, Xue Jiang, Si Zhou and Jijun Zhao

    Two-dimensional (2D) ferromagnets with high Curie temperature have long been the pursuit for electronic and spintronic applications. CrI 3 is a rising star of intrinsic 2D ferromagnets, however, it suffers from weak exchange coupling. Here we propose a general strategy of self-intercalation to achieve enhanced ferromagnetism in bilayer CrI 3 . We show that filling either Cr or I atoms into the van

    更新日期:2020-10-12
  • A Ubiquitous Thermal Conductivity Formula for Liquids, Polymer Glass, and Amorphous Solids
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-11
    Qing Xi, Jinxin Zhong, Jixiong He, Xiangfan Xu, Tsuneyoshi Nakayama, Yuanyuan Wang, Jun Liu, Jun Zhou and Baowen Li

    The microscopic mechanism of thermal transport in liquids and amorphous solids has been an outstanding problem for a long time. There have been several approaches to explain the thermal conductivities in these systems, for example, Bridgman’s formula for simple liquids, the concept of the minimum thermal conductivity for amorphous solids, and the thermal resistance network model for amorphous polymers

    更新日期:2020-10-12
  • X 0 (2900) and X 1 (2900): Hadronic Molecules or Compact Tetraquarks
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-11
    Hua-Xing Chen, Wei Chen, Rui-Rui Dong and Niu Su

    Very recently the LHCb collaboration reported their observation of the first two fully open-flavor tetraquark states, the X 0 (2900) of J P = 0 + and the X 1 (2900) of J P = 1 − . We study their possible interpretations using the method of QCD sum rules, paying special attention to an interesting feature of this experiment that the higher resonance X 1 (2900) has a width significantly larger than the

    更新日期:2020-10-12
  • Giant Spin Transfer Torque in Atomically Thin Magnetic Bilayers
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-10-11
    Weihao Cao, Matisse Wei-Yuan Tu, Jiang Xiao and Wang Yao

    In cavity quantum electrodynamics, the multiple reflections of a photon between two mirrors defining a cavity is exploited to enhance the light-coupling of an intra-cavity atom. We show that this paradigm for enhancing the interaction of a flying particle with a localized object can be generalized to spintronics based on van der Waals 2D magnets. Upon tunneling through a magnetic bilayer, we find that

    更新日期:2020-10-12
  • Constructing a Maximally Entangled Seven-Qubit State via Orthogonal Arrays
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Xin-Wei Zha, Min-Rui Wang and Ruo-Xu Jiang

    Huber et al. [Phys. Rev. Lett. 118 (2017) 200502] have proved that a seven-qubit state whose three-body marginal states are all maximally mixed does not exist. Here, we propose a method to build a maximally entangled state based on orthogonal arrays to construct maximally entangled seven-qubit states. Using this method, we not only determine that a seven-qubit state whose three-body marginals are all

    更新日期:2020-09-14
  • Performance Enhancement of AlGaN/GaN MIS-HEMTs Realized via Supercritical Nitridation Technology
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Meihua Liu, Zhangwei Huang, Kuanchang Chang, Xinnan Lin, Lei Li and Yufeng Jin

    This paper proposes a method of repairing interface defects by supercritical nitridation technology, in order to suppress the threshold voltage shift of AlGaN/GaN metal-insulator-semiconductor high-electron-mobility transistors (MIS-HEMTs). We find that supercritical NH 3 fluid has the characteristics of both liquid NH 3 and gaseous NH 3 simultaneously, i.e., high penetration and high solubility, which

    更新日期:2020-09-14
  • Regular Arrangement of Two-Dimensional Clusters of Blue Phosphorene on Ag(111)
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Shuo Yang, Zhenpeng Hu, Weihai Wang, Peng Cheng, Lan Chen and Kehui Wu

    Two-dimensional (2D) blue phosphorene with a honeycomb structure is the phosphorus analog of graphene, and is regarded as a promising 2D material with a large tunable band gap and high charge-carrier mobility. Here, using the molecular beam epitaxy method, we synthesize monolayer blue phosphorene on the Ag(111) surface. Combined with first-principles calculations, scanning tunneling microscopy measurements

    更新日期:2020-09-14
  • Directly Determining the Interface Structure and Band Offset of a Large-Lattice-Mismatched CdS/CdTe Heterostructure
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Quanyin Tang, Ji-Hui Yang, Zhi-Pan Liu and Xin-Gao Gong

    The CdS/CdTe heterojunction plays an important role in determining the energy conversion efficiency of CdTe solar cells. However, the interface structure remains unknown, due to the large lattice mismatch between CdS and CdTe, posing great challenges to achieving an understanding of its interfacial effects. By combining a neural-network-based machine-learning method and the stochastic surface walking-based

    更新日期:2020-09-14
  • Extended Nernst–Planck Equation Incorporating Partial Dehydration Effect
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Zhong Wang, Zhiyang Yuan and Feng Liu

    Novel ionic transporting phenomena emerge as nanostructures approach the molecular scale. At the sub-2nm scale, widely used continuum equations, such as the Nernst–Planck equation, break down. Here, we extend the Nernst–Planck equation by adding a partial dehydration effect. Our model agrees with the reported ion fluxes through graphene oxide laminates with sub-2nm interlayer spacing, outperforming

    更新日期:2020-09-14
  • Room-Temperature Processed Amorphous ZnRhCuO Thin Films with p-Type Transistor and Gas-Sensor Behaviors
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Bojing Lu, Rumin Liu, Siqin Li, Rongkai Lu, Lingxiang Chen, Zhizhen Ye and Jianguo Lu

    We examine an amorphous oxide semiconductor (AOS) of ZnRhCuO. The a -ZnRhCuO films are deposited at room temperature, having a high amorphous quality with smooth surface, uniform thickness and evenly distributed elements, as well as a high visible transmittance above 87% with a wide bandgap of 3.12 eV. Using a -ZnRhCuO films as active layers, thin-film transistors (TFTs) and gas sensors are fabricated

    更新日期:2020-09-14
  • Significantly Improving the Escape Time of a Single 40 Ca + Ion in a Linear Paul Trap by Fast Switching of the Endcap Voltage
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Peng-Peng Zhou, Shao-Long Chen, Shi-Yong Liang, Wei Sun, Huan-Yao Sun, Yao Huang, Hua Guan and Ke-Lin Gao

    Sympathetic cooling is a method used to lower the kinetic energy of ions with complicated energy-level structures, via Coulomb interactions with laser-cooled ions in an ion trap. The ion to be sympathetically cooled is sometimes prepared outside of the trap, and it is critical to introduce this ion into the trap by temporarily lowering the potential of one endcap without allowing the coolant ion to

    更新日期:2020-09-14
  • Novel Polarization Control Approach to Long-Term Fiber-Optic Frequency Transfer
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Dong-Jie Wang, Xiang Zhang, Jie Liu, Dong-Dong Jiao, Xue Deng, Jing Gao, Qi Zang, Dan Wang, Tao Liu, Rui-Fang Dong and Shou-Gang Zhang

    We demonstrate a novel polarization control system based on a gradient descent algorithm, applied to a 450-km optical frequency transfer link. The power of the out-loop beat note is retrieved by controlling the polarization state of the transferred signal, with a recovery time of 24 ms, thereby ensuring the long-term evaluation of the fiber link. As a result, data utilization is enhanced from 70% to

    更新日期:2020-09-14
  • Tunable Superconductivity in 2H-NbSe 2 via in situ Li Intercalation
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Kaiyao Zhou, Jun Deng, Liwei Guo and Jiangang Guo

    Using the newly-developed solid ionic gating technique, we measure the electrical transport property of a thin-flake NbSe 2 superconductor ( T c = 6.67 K) under continuous Li intercalation and electron doping. It is found that the charge-density-wave transition is suppressed, while at the same time a carrier density, decreasing from 7 × 10 14 cm –2 to 2 × 10 14 cm –2 also occurs. This tunable capability

    更新日期:2020-09-14
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