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  • 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
  • Rescaled Range Permutation Entropy: A Method for Quantifying the Dynamical Complexity of Extreme Volatility in Chaotic Time Series
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Jia-Chen Zhang, Wei-Kai Ren and Ning-De Jin

    Information entropy, as a quantitative measure of complexity in nonlinear systems, has been widely researched in a variety of contexts. With the development of a nonlinear dynamic, the entropy is faced with severe challenges in dealing with those signals exhibiting extreme volatility. In order to address this problem of weighted permutation entropy, which may result in the inaccurate estimation of

    更新日期:2020-09-14
  • Phase-Gradient Metasurfaces Based on Local Fabry–Pérot Resonances
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Yanyan Cao, Bocheng Yu, Yangyang Fu, Lei Gao and Yadong Xu

    In this work, we present a new mechanism for designing phase-gradient metasurfaces (PGMs) to control an electromagnetic wavefront with high efficiency. Specifically, we design a transmission-type PGM, formed by a periodic subwavelength metallic slit array filled with identical dielectrics of different heights. It is found that when Fabry–Pérot (FP) resonances occur locally inside the dielectric regions

    更新日期:2020-09-14
  • The Analytic Eigenvalue Structure of the 1+1 Dirac Oscillator
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Bo-Xing Cao and Fu-Lin Zhang

    We study the analytic structure for the eigenvalues of the one-dimensional Dirac oscillator, by analytically continuing its frequency on the complex plane. A twofold Riemann surface is found, connecting the two states of a pair of particle and antiparticle. One can, at least in principle, accomplish the transition from a positive energy state to its antiparticle state by moving the frequency continuously

    更新日期:2020-09-14
  • Controllable Modulation to Quantum Well States on β-Sn Islands
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Ze-Rui Wang, Chen-Xiao Zhao, Guan-Yong Wang, Jin Qin, Bing Xia, Bo Yang, Dan-dan Guan, Shi-Yong Wang, Hao Zheng, Yao-Yi Li, Can-hua Liu and Jin-Feng Jia

    We investigate the surface structure and electronic properties of β -Sn islands deposited on a graphitized 6H-SiC (0001) substrate via low temperature scanning tunneling microscopy and spectroscopy. Owing to the confinement of the island geometry, quantum well states (QWSs) are formed, manifesting as equidistant peaks in the tunneling spectra. Furthermore, a distinct strip feature appears on the surfaces

    更新日期:2020-09-14
  • Verification of Energetic-Particle-Induced Geodesic Acoustic Mode in Gyrokinetic Particle Simulations
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Yang Chen, Wenlu Zhang, Jian Bao, Zhihong Lin, Chao Dong, Jintao Cao and Ding Li

    The energetic-particle-induced geodesic acoustic mode (EGAM) is studied using gyrokinetic particle simulations in tokamak plasmas. In our simulations, exponentially growing EGAMs are excited by energetic particles with a slowing-down distribution. The frequencies of EGAMs are always below the frequencies of GAMs, which is due to the non-perturbative contribution of energetic particles (EPs). The mode

    更新日期:2020-09-14
  • Butterfly-Like Anisotropic Magnetoresistance and Angle-Dependent Berry Phase in a Type-II Weyl Semimetal WP 2
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Kaixuan Zhang, Yongping Du, Pengdong Wang, Laiming Wei, Lin Li, Qiang Zhang, Wei Qin, Zhiyong Lin, Bin Cheng, Yifan Wang, Han Xu, Xiaodong Fan, Zhe Sun, Xiangang Wan and Changgan Zeng

    The Weyl semimetal has emerged as a new topologically nontrivial phase of matter, hosting low-energy excitations of massless Weyl fermions. Here, we present a comprehensive study of a type-II Weyl semimetal WP 2 . Transport studies show a butterfly-like magnetoresistance at low temperature, reflecting the anisotropy of the electron Fermi surfaces. This four-lobed feature gradually evolves into a two-lobed

    更新日期:2020-09-14
  • A New Quasi-One-Dimensional Ternary Molybdenum Pnictide Rb 2 Mo 3 As 3 with Superconducting Transition at 10.5K
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Kang Zhao, Qing-Ge Mu, Bin-Bin Ruan, Meng-Hu Zhou, Qing-Song Yang, Tong Liu, Bo-Jin Pan, Shuai Zhang, Gen-Fu Chen and Zhi-An Ren

    We report superconductivity in a new ternary molybdenum pnictide Rb 2 Mo 3 As 3 , synthesized via the solid state reaction method. Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group ##IMG## [http://ej.iop.org/images/0256-307X/37/9/097401/cpl_37_9_097401_ieqn1.gif] {$P\bar{6}m2$} (No. 187), and the refined lattice parameters are a = 10.431(5) Å, c = 4.460(4) Å.

    更新日期:2020-09-14
  • Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Qian Sui, Jiaxin Zhang, Suhua Jin, Yunyouyou Xia and Gang Li

    We examine quantum anomalous Hall (QAH) insulators with intrinsic magnetism displaying quantized Hall conductance at zero magnetic fields. The spin-momentum locking of the topological edge stats promises QAH insulators with great potential in device applications in the field of spintronics. Here, we generalize Haldane’s model on the honeycomb lattice to a more realistic two-orbital case without the

    更新日期:2020-09-14
  • Chalcogenide Perovskite YScS 3 as a Potential p-Type Transparent Conducting Material
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-13
    Han Zhang, Chen Ming, Ke Yang, Hao Zeng, Shengbai Zhang and Yi-Yang Sun

    Transparent conducting materials (TCMs) have been widely used in optoelectronic applications such as touchscreens, flat panel displays and thin film solar cells. These applications of TCMs are currently dominated by n-type doped oxides. High-performance p-type TCMs are still lacking due to their low hole mobility or p-type doping bottleneck, which impedes efficient device design and novel applications

    更新日期:2020-09-14
  • Ultrafast Quasiparticle Dynamics and Electron-Phonon Coupling in (Li 0.84 Fe 0.16 )OHFe 0.98 Se
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-09
    Qiong Wu, Huaxue Zhou, Yanling Wu, Lili Hu, Shunli Ni, Yichao Tian, Fei Sun, Fang Zhou, Xiaoli Dong, Zhongxian Zhao and Jimin Zhao

    Distinctive superconducting behaviors between bulk and monolayer FeSe make it challenging to obtain a unified picture of all FeSe-based superconductors. We investigate the ultrafast quasiparticle (QP) dynamics of an intercalated superconductor (Li 1 – x Fe x )OHFe 1 – y Se, which is a bulk crystal but shares a similar electronic structure with single-layer FeSe on SrTiO 3 . We obtain the electron-phonon

    更新日期:2020-09-10
  • Mott Transition and Superconductivity in Quantum Spin Liquid Candidate NaYbSe 2
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-09
    Ya-Ting Jia, Chun-Sheng Gong, Yi-Xuan Liu, Jian-Fa Zhao, Cheng Dong, Guang-Yang Dai, Xiao-Dong Li, He-Chang Lei, Run-Ze Yu, Guang-Ming Zhang and Chang-Qing Jin

    The Mott transition is one of the fundamental issues in condensed matter physics, especially in the system with antiferromagnetic long-range order. However, such a transition is rare in quantum spin liquid (QSL) systems without long-range order. Here we report the experimental pressure-induced insulator to metal transition followed by the emergence of superconductivity in the QSL candidate NaYbSe 2

    更新日期:2020-09-10
  • Pressure-Dependent Point-Contact Spectroscopy of Superconducting PbTaSe 2 Single Crystals
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-09-09
    Hai Zi, Ling-Xiao Zhao, Xing-Yuan Hou, Lei Shan, Zhian Ren, Gen-Fu Chen and Cong Ren

    We develop an experimental tool to investigate the order parameter of superconductors by combining point-contact spectroscopy measurement with high-pressure technique. It is demonstrated for the first time that planar point-contact spectroscopy measurement on noncentrosymmetric superconducting PbTaSe 2 single crystals is systematically subjected to hydrostatic pressures up to 12.1 kbar. Under such

    更新日期:2020-09-10
  • Coupling between Particle Shape and Long-Range Interaction in the High-Density Regime
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Can-can Zhou, Hongchuan Shen, Hua Tong, Ning Xu and Peng Tan

    We experimentally probe the coupling between particle shape and long-range interaction, using long-range interacting polygons. For two typical space-filling polygons, square and triangle, we find two types of coupling modes that predominantly control the structure formation. Specifically, the rotational ordering of squares brings a lattice deformation that produces a hexagonal-to-rhombic transition

    更新日期:2020-08-18
  • de Haas-van Alphen Quantum Oscillations in BaSn 3 Superconductor with Multiple Dirac Fermions
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Gaoning Zhang, Xianbiao Shi, Xiaolei Liu, Wei Xia, Hao Su, Leiming Chen, Xia Wang, Na Yu, Zhiqiang Zou, Weiwei Zhao and Yanfeng Guo

    Characterization of Fermi surface of the BaSn 3 superconductor ( T c ∼ 4.4 K) by de Haas–van Alphen (dHvA) effect measurement reveals its non-trivial topological properties. Analysis of non-zero Berry phase is supported by the ab initio calculations, which reveals a type-II Dirac point setting and tilting along the high symmetric K – H line of the Brillouin zone, about 0.13 eV above the Fermi level

    更新日期:2020-08-18
  • A Nonlinear Theoretical Model of Magnetization and Magnetostriction for Ferromagnetic Materials under Applied Stress and Magnetic Fields
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Pengpeng Shi

    A thermodynamic and micro-statistical model is proposed to explain the magnetization and magnetostriction mechanisms for isotropic ferromagnetic materials. Here a nonlinear magnetostrictive expression enhances the characterization of the nonlinear magnetic-mechanical effect, and the Brillouin function makes it possible to describe the relationship between the equivalent field and magnetization for

    更新日期:2020-08-18
  • Characterization of Scanning SQUID Probes Based on 3D Nano-Bridge Junctions in Magnetic Field
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Yin-Ping Pan, Yue Wang, Ruo-Ting Yang, Yan Tang, Xiao-Yu Liu, Hua Jin, Lin-Xian Ma, Yi-Shi Lin, Zhen Wang, Jie Ren, Yi-Hua Wang and Lei Chen

    We develop superconducting quantum interference device (SQUID) probes based on 3D nano-bridge junctions for the scanning SQUID microscopy. The use of these nano-bridge junctions enables imaging in the presence of a high magnetic field. Conventionally, a superconducting ground layer has been employed for better magnetic shielding. In our study, we prepare a number of scanning SQUID probes with and without

    更新日期:2020-08-18
  • Enhancement of Curie Temperature under Built-in Electric Field in Multi-Functional Janus Vanadium Dichalcogenides
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Shilei Ji, Hong Wu, Shuang Zhou, Wei Niu, Lujun Wei, Xing-Ao Li, Feng Li and Yong Pu

    Functionalized two-dimensional materials with multiferroicity are highly desired to be next-generation electronic devices. Here we theoretically predict a family of Janus vanadium dichalcogenides VXX’ (X/X’ = S, Se, Te) monolayers with multiferroic properties, combing ferromagnetism, ferroelasticity and piezoelectricity. Due to the unpaired electrons on the V atom, the Janus VXX’ monolayers have intrinsic

    更新日期:2020-08-18
  • Multi-Core Conformal Lenses
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Xinghong Zhu, Pengfei Zhao and Huanyang Chen

    We propose multi-core conformal lenses by combining conformal transformation optics with absolute instruments. Depending on the cores and incident angles, the conformal lenses have tunable functionalities like focusing, reflection, and transparency, thereby providing a feasible general method for designing multi-functional devices.

    更新日期:2020-08-18
  • Direct Strong Measurement of a High-Dimensional Quantum State
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Chen-Rui Zhang, Meng-Jun Hu, Guo-Yong Xiang, Yong-Sheng Zhang, Chuan-Feng Li and Guang-Can Guo

    It is of great importance to determine an unknown quantum state for fundamental studies of quantum mechanics, yet it is still difficult to characterize systems of large dimensions in practice. Although the scan-free direct measurement approach based on a weak measurement scheme was proposed to measure a high-dimensional photonic state, how weak the interaction should be to give a correct estimation

    更新日期:2020-08-18
  • Pressure Generation above 35GPa in a Walker-Type Large-Volume Press
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Yu-Chen Shang, Fang-Ren Shen, Xu-Yuan Hou, Lu-Yao Chen, Kuo Hu, Xin Li, Ran Liu, Qiang Tao, Pin-Wen Zhu, Zhao-Dong Liu, Ming-Guang Yao, Qiang Zhou, Tian Cui and Bing-Bing Liu

    Pressure generation to a higher pressure range in a large-volume press (LVP) denotes our ability to explore more functional materials and deeper Earth’s interior. Pressure generated by normal tungsten carbide (WC) anvils in a commercial way is mostly limited to 25GPa in LVPs due to the limitation of their hardness and design of cell assemblies. We adopt three newly developed WC anvils for ultrahigh

    更新日期:2020-08-18
  • Photon Coalescence in a Lossy Non-Hermitian Beam Splitter
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Zhiqiang Ren, Rong Wen and J. F. Chen

    We investigate photon coalescence in a lossy non-Hermitian system and study a dynamic device modeled by a beam splitter with an extra intrinsic phase term added in the transformation matrix, with which the device is a lossy non-Hermitian linear system. The two-photon interference behavior is altered accordingly since this extra intrinsic phase affects the unitary of transformation and the coalescence

    更新日期:2020-08-18
  • Temperature Gradient, Toroidal and Ion FLR Effects on Drift-Tearing Modes
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Hao Shi, Wenlu Zhang, Chao Dong, Jian Bao, Zhihong Lin, Jintao Cao and Ding Li

    The influences of the temperature gradient and toroidal effects on drift-tearing modes have been studied using the Gyrokinetic Toroidal code. After the thermal force term is introduced into the parallel electron force balance equation, the equilibrium temperature gradient can cause a significant increase in the growth rate of the drift-tearing mode and a broadening of the mode structure. The simulation

    更新日期:2020-08-18
  • A New Cu-Based Metallic Glass Composite with Excellent Mechanical Properties
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Dong-Mei Li, Lan-Sheng Chen, Peng Yu, Ding Ding and Lei Xia

    A new Cu-based bulk metallic glass composite of nominal composition (at.%) Cu 41 Ni 27 Ti 25 Al 7 with excellent plasticity and a strong work-hardening behavior is fabricated. Strength above 1859 MPa and plasticity more than 11% are achieved under compression and tension modes. The deformation mechanism is proposed to the structural heterogeneities of the composite that promotes multiple shear bands

    更新日期:2020-08-18
  • Experimental Observation of Electronic Structures of Kagome Metal YCr 6 Ge 6
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Pengdong Wang, Yihao Wang, Bo Zhang, Yuliang Li, Sheng Wang, Yunbo Wu, Hongen Zhu, Yi Liu, Guobin Zhang, Dayong Liu, Yimin Xiong and Zhe Sun

    Using angle-resolved photoemission spectroscopy, we study electronic structures of a Kagome metal YCr 6 Ge 6 . Band dispersions along k z direction are significant, suggesting a remarkable interlayer coupling between neighboring Kagome planes. Comparing ARPES data with first-principles calculations, we find a moderate electron correlation in this material, since band calculations must be compressed

    更新日期:2020-08-18
  • Machine Learning for Many-Body Localization Transition
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Wen-Jia Rao

    We employ the methods of machine learning to study the many-body localization (MBL) transition in a 1D random spin system. By using the raw energy spectrum without pre-processing as training data, it is shown that the MBL transition point is correctly predicted by the machine. The structure of the neural network reveals the nature of this dynamical phase transition that involves all energy levels,

    更新日期:2020-08-18
  • Electronic Evolution from the Parent Mott Insulator to a Superconductor in Lightly Hole-Doped Bi 2 Sr 2 CaCu 2 O 8 + δ
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Qiang Gao, Lin Zhao, Cheng Hu, Hongtao Yan, Hao Chen, Yongqing Cai, Cong Li, Ping Ai, Jing Liu, Jianwei Huang, Hongtao Rong, Chunyao Song, Chaohui Yin, Qingyan Wang, Yuan Huang, Guo-Dong Liu, Zu-Yan Xu and Xing-Jiang Zhou

    High temperature superconductivity in cuprates is realized by doping the Mott insulator with charge carriers. A central issue is how such an insulating state can evolve into a conducting or superconducting state when charge carriers are introduced. Here, by in situ vacuum annealing and Rb deposition on the Bi 2 Sr 2 Ca 0.6 Dy 0.4 Cu 2 O 8 + δ (Bi2212) sample surface to push its doping level continuously

    更新日期:2020-08-18
  • ##IMG## [http://ej.iop.org/images/0256-307X/37/8/081101/toc_cpl_37_8_081101_ieqn1.gif] {${\mathscr{P}}{\mathscr{T}}$} Symmetry of a Square-Wave Modulated Two-Level System
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Liwei Duan, Yan-Zhi Wang and Qing-Hu Chen

    We study a non-Hermitian two-level system with square-wave modulated dissipation and coupling. Based on the Floquet theory, we achieve an effective Hamiltonian from which the boundaries of the ##IMG## [http://ej.iop.org/images/0256-307X/37/8/081101/toc_cpl_37_8_081101_ieqn1.gif] {${\mathscr{P}}{\mathscr{T}}$} phase diagram are captured exactly. Two kinds of ##IMG## [http://ej.iop.org/images/0256-3

    更新日期:2020-08-18
  • Type-II Dirac Semimetal State in a Superconductor Tantalum Carbide
    Chin. Phys. Lett. (IF 1.08) Pub Date : 2020-08-16
    Zhihai Cui, Yuting Qian, Wei Zhang, Hongming Weng and Zhong Fang

    The exploration of topological Dirac semimetals with intrinsic superconductivity can be a most plausible way to discover topological superconductors. We propose that type-II Dirac semimetal states exist in the band structure of TaC, a well-known s-wave superconductor, by using the first-principles calculations and the k ⋅ p effective model. The tilted gapless Dirac cones, which are composed of Ta d

    更新日期:2020-08-18
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