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Prediction of crossing nodal-lines and large intrinsic spin Hall conductivity in topological Dirac semimetal Ta3As family

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npj computational Materials 2021年第1期7卷 333-337页

作者： Wenjie Hou Jian Liu Xi Zuo Jian Xu Xueying Zhang Desheng Liu Mingwen Zhao Zhen-Gang Zhu Hong-Gang Luo Weisheng Zhao Fert Beijing Institute MIIT Key Laboratory of SpintronicsSchool of Integrated Circuit Science and EngineeringBeihang UniversityBeijingChina Beihang-Goertek Joint Microelectronics Institute Qingdao Research InstituteBeihang UniversityQingdaoChina School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinanChina Beijing Computational Science Research Center BeijingChina School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijingChina CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijingChina School of Physical Science and Technology Lanzhou UniversityLanzhouChina

Topological insulators(TIs)are considered as ideal platforms for generating large spin Hall conductivity(SHC),however,the bulk carrier problem,which is unavoidable in TIs,hinders their practical ***,topological semimetals(TSMs)have been proposed to achieve large SHC to replace ***,the ideal TSM candidates with large SHC are still *** terms of firstprinciples calculations,we predict that Ta3As family compounds exhibit complex crossing nodal-lines(CNL)properties in absence of the spin-orbit coupling(SOC).However,they transfer to Dirac TSMs under the influence of strong SOC,and present large SHC around Fermi level in ***,the SHC value of Ta_(3)Y(Y=As,Sb,Bi)is around 1500–1700 e/h=eTeΩ·cmT^(-1),which is comparable to noble metal Pt and much larger than TIs,Weyl TSMs,and 4d/5d transition *** work not only suggests a kind of TSM family with interesting Dirac CNL around Fermi level,but also paves the way for searching large intrinsic SHC materials in complex CNL TSM systems.

关键词： topological Dirac conductivity

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Teleportation of atomic states within cavities in thermal states

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Physical Review A 2001年第4期63卷 044302-044302页

作者： Shi-Biao Zheng Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China Hefei 230026 People’s Republic of China Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 People’s Republic of China

A scheme is proposed for the teleportation of atomic states within cavities. The scheme is insensitive to the cavity field states and cavity decay. The teleportation may be achieved in a simple way. We show how the idea can be used to generate multiatom entangled states. In order to entangle n atoms, we require n−1 cavities and allow the first cavity to exchange energy with the environment. The other n−2 cavities are always in the vacuum state and thus the cavity decay is suppressed.

关键词： Quantum theory

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Formation of N-body polymer molecules through generalized stimulated Raman adiabatic passage

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Physical Review A 2013年第4期87卷 043631-043631页

作者： Fu-quan Dou Li-bin Fu Jie Liu College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China School of Physics Beijing Institute of Technology Beijing 100081 China National Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Key Laboratory of High Energy Density Physics Simulation Center for Applied Physics and Technology Peking University Beijing 100084 China

We investigate the creation of stable homonuclear and heteronuclear N-body polymer molecules from ultracold atoms via a generalized stimulated Raman adiabatic passage scheme. The atom-molecule dark-state solutions for the system are obtained and are found to satisfy universal algebraic equations. We discuss the linear instability and the adiabatic fidelity of the dark state. We also explore the effects of the interparticle interactions, the atomic number of the polymer, and external field parameters on the conversion process.

关键词： DARK states (Quantum optics) ADIABATIC processes MANY-body problem ATOMS ALGEBRAIC equations ATOMIC number

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Topological magnetic line defects in Fe(Te, Se) high-temperature superconductors

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Quantum Frontiers 2023年第1期2卷 1-7页

作者： Wu, Xianxin Yin, Jia-Xin Liu, Chao-Xing Hu, Jiangping CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics Southern University of Science and Technology Guangdong Shenzhen China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen China Department of Physics The Pennsylvania State University University Park 16802 PA United States Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China CAS Center of Excellence in Topological Quantum Computation and Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Beijing 100190 China

The realization of Majorana zero modes in condensed matter have been attracting enormous interests from fundamental science such as topological quantum computation. Recently iron based superconductors were identified as a high-temperature platform for realizing topological superconductivity and Majorana modes. As unconventional superconductors, one of the most important characteristics of them is that they are in the vicinity of magnetic states due to the strong Hund’s coupling in iron atoms. Here we propose that the line defects with missing Te/Se anions in Fe(Se, Te) superconductors provide the realization of intrinsic antiferromagnetic (AFM) chains with Rashba spin-orbit coupling. Against conventional wisdom, Majorana zero modes (MZMs) can be robustly generated at these AFM chain ends. These results can consistently explain the recent experimental observation of zero-energy end states in line defects of monolayer Fe(Te, Se)/SrTiO₃ by scanning tunneling microscopy (STM) measurements. Our research not only demonstrates an unprecedented interplay among native line defect, emergent magnetism and topological superconductivity but also explores a high-temperature platform for Majorana fermions. © The Author(s) 2023.

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Subcycle Dynamics of Coulomb Asymmetry in Strong Elliptical Laser Fields

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Physical Review Letters 2013年第2期111卷 023006-023006页

作者： Min Li Yunquan Liu Hong Liu Qicheng Ning Libin Fu Jie Liu Yongkai Deng Chengyin Wu Liang-You Peng Qihuang Gong Department of Physics and State Key Laboratory for Mesoscopic Physics Peking University Beijing 100871 People’s Republic of China National Key Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 People’s Republic of China Center for Applied Physics and Technology Peking University Beijing 100084 People’s Republic of China

We measure photoelectron angular distributions of noble gases in intense elliptically polarized laser fields, which indicate strong structure-dependent Coulomb asymmetry. Using a dedicated semiclassical model, we have disentangled the contribution of direct ionization and multiple forward scattering on Coulomb asymmetry in elliptical laser fields. Our theory quantifies the roles of the ionic potential and initial transverse momentum on Coulomb asymmetry, proving that the small lobes of asymmetry are induced by direct ionization and the strong asymmetry is induced by multiple forward scattering in the ionic potential. Both processes are distorted by the Coulomb force acting on the electrons after tunneling. Lowering the ionization potential, the relative contribution of direct ionization on Coulomb asymmetry substantially decreases and Coulomb focusing on multiple rescattering is more important. We do not observe evident initial longitudinal momentum spread at the tunnel exit according to our simulation.

关键词： COULOMB'S law IONIZATION energy IONIZATION (Atomic physics) ELECTRON tunneling MOMENTUM distributions

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High-fidelity fast quantum driving in nonlinear systems

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Physical Review A 2014年第1期89卷 012123-012123页

作者： F. Q. Dou L. B. Fu J. Liu Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China School of Physics Beijing Institute of Technology Beijing 100081 China National Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Key Laboratory of High Energy Density Physics Simulation (HEDPS) Center for Applied Physics and Technology Peking University Beijing 100084 China

We investigate high-fidelity quantum driving in a nonlinear two-level system and find that nonlinear atomic interaction can break the speed limit of the linear model. We show that repulsive atomic interaction can decrease the minimal time requested for reaching target state even to zero, while attractive atomic interaction tends to increase the minimal time. There exists a critical attractive interaction beyond which the target state cannot be reached with high fidelity. Possible experimental observation of the nonlinear effects using a Bose-Einstein condensate in an accelerating optical lattice is discussed.

关键词： QUANTUM states NONLINEAR systems ATOMIC interactions SPEED limits LINEAR models (Statistics) OPTICAL lattices

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Creating pentamer molecules by generalized stimulated Raman adiabatic passage

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Physical Review A 2012年第2期85卷 023629-023629页

作者： Fu-Quan Dou Sheng-Chang Li Hui Cao Li-Bin Fu School of Physics Beijing Institute of Technology Beijing 100081 China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China National Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Key Laboratory of High Energy Density Physics Simulation Center for Applied Physics and Technology Peking University Beijing 100084 China

We study the formation of stable homonuclear and heteronuclear pentamers from ultracold atoms via a generalized stimulated Raman adiabatic passage scheme. The atom-molecule dark-state solutions for the system are obtained, and the linear instability and the adiabatic fidelity of the dark state are investigated. We also discuss the effects of external field parameters on the conversion efficiency.

关键词： ULTRACOLD molecules RAMAN effect ATOMIC theory ADIABATIC processes PARAMETER estimation ENERGY conversion

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Implementing universal multiqubit quantum logic gates in three- and four-spin systems at room temperature

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Physical Review A 2001年第4期63卷 042302-042302页

作者： Jiangfeng Du Mingjun Shi Jihui Wu Xianyi Zhou Rongdian Han Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of China Hefei 230026 People’s Republic of China Department of Modern Physics University of Science and Technology of China Hefei 230026 People’s Republic of China Laboratory of Structure Biology University of Science and Technology of China Hefei 230026 People’s Republic of China

In this paper, we present the experimental realization of multiqubit gates Λn(NOT) in macroscopic ensemble of three-qubit and four-qubit molecules. Instead of depending heavily on the two-bit universal gate, which served as the basic quantum operation in quantum computing, we use pulses of well-defined frequency and length that simultaneously apply to all qubits in a quantum register. It appears that this method is experimentally convenient when this procedure is extended to more qubits on some quantum computation, and it can also be used in other physical systems.

关键词： Logic gates

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Holographic topological semimetals

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science China(physics,Mechanics & Astronomy) 2020年第5期63卷 6-30页

作者： Karl Landsteiner Yan Liu Ya-Wen Sun Instiuto de Fisica Teorica UAM/CSIC C/Nicolas Cabrera 13-15Campus CantoblancoCantoblanco 28049Spain Center for Gravitational Physics Department of Space ScienceBeihang UniversityBejing 100191China Key Laboratory of Space Environment Monitoring and Information Processing Ministry of Indusry and Information Technology.Beijing 100191China School of Physics&CAS Center for Excllence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China Kavli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100049China

The holographic duality allows to construct and study models of strongly coupled quantum matter via dual gravitational *** general such models are characterized by the absence of quasiparticles, hydrodynamic behavior and Planckian dissipation times. One particular interesting class of quantum materials are ungapped topological semimetals which have many interesting properties from Hall transport to topologically protected edge states. We review the application of the holographic duality to this type of quantum matter including the construction of holographic Weyl semimetals, nodal line semimetals, quantum phase transition to trivial states(ungapped and gapped), the holographic dual of Fermi arcs and how new unexpected transport properties,such as Hall viscosities arise. The holographic models promise to lead to new insights into the properties of this type of quantum matter.

关键词： gauge/gravity duality topological semimetal Weyl semimetal anomaly

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Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors

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science China Chemistry 2019年第7期62卷 897-903页

作者： Lei Yang Linqing Qin Yunxiao Xu Huotian Zhang Lei Lv Kepeng Chen Xinyu Sui Yangguang Zhong Yuan Guo Feng Gao Jianzhang Zhao Yuhao Li Xinfeng Liu Yuanping Yi Xinhui Lu Aidong Peng Hui Huang College of Materials Science and Optoelectronic Technology Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences Beijing 101408 China Department of Chemical Engineering Imperial College London London SW7 24Z United Kingdom Biomolecular and Organic Electronics Department of Physics Chemistry and Biology (IFM) Linkoping University Linkuping SE-58183 Sweden Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Physics The Chinese University of Hong Kong Shatin NT 999077 Hong Kong China

The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptors BFPSP and BFPTP were reported by simply changing the chalcogen atoms from S to Te. The differences between BFPSP and BFPTP in light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TDDFTcalculations revealed that the triplet excited state(T1) in energy of BFPTP equals to the charge transfer(CT) state in PBDBT:BFPTP, which allows T1 excitons, generated by intersystem crossing, to split into free charges to contribute to the *** contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.

关键词： heteroatom effects triplet state tellurophene nonfullerene acceptor organic solar cells

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