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34th Annual International Symposium on Lattice Field Theory, LATTICE 2016

作者： Leskovec, Luka Alexandrou, Constantia Koutsou, Giannis Meinel, Stefan Negele, John W. Paul, Srijit Petschlies, Marcus Pochinsky, Andrew Rendon, Gumaro Syritsyn, Sergey Department of Physics University of Arizona TucsonAZ85721 United States Department of Physics University of Cyprus NicosiaCY 1678 Cyprus Computation-based Science and Technology Research Center Cyprus Institute NicosiaCY 2121 Cyprus RIKEN BNL Research Center Brookhaven National Laboratory UptonNY11973 United States Center for Theoretical Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Mathematics and Natural Sciences University of Wuppertal WuppertalD-42119 Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn BonnD-53115 Germany Department of Physics and Astronomy Stony Brook University Stony BrookNY11794 United States

Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for 1 → 2 transition matrix elements in a finite volume now enable the determination of radiative decay rates of strongly unstable particles. Our lattice QCD study focuses on the process ππ → πγ∗, where the ρ meson is present as an enhancement in the cross-section. We use 2+1 flavors of clover fermions at a pion mass of approximately 320 MeV and a lattice size of approximately 3.6 fm. The required 2-point and 3-point correlation functions are constructed from a set of forward, sequential and stochastic light quark propagators. In addition to determining the ρ meson resonance parameters via the Lüscher method, the scattering phase shift is used in conjunction with the 1 → 2 transition matrix element formalism of Briceño, Hansen and Walker-Loud [1] to compute the ππ → πγ∗ amplitude at several values of the momentum transfer and pp invariant mass. © Copyright owned by the author(s).

关键词： Hadrons

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中心对称且具有非简单空间群结构的晶体中可调控的Dzyaloshinskii-Moriya相互作用

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science Bulletin 2023年第11期68卷 1113-1118,M0003页

作者：张中义秦盛山臧佳栋方辰胡江平张富春 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics Beijing Institute of TechnologyBeijing 100081China Kavli Institute for Theoretical Sciences CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy University of New HampshireDurham 03824USA Materials Science Program University of New HampshireDurham 03824USA South Bay Interdisciplinary Science Center Dongguan 523808China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

非中心对称材料中存在的Dzyaloshinskii-Moriya(DM)相互作用,可以导致新颖的自旋纹理和奇异的手性物理现象.而如果能在中心对称的晶格中发现DM相互作用,这将可以大大丰富实现上述新奇物理的材料体系.本文发现中心对称的且遵循非简单空... 详细信息

非中心对称材料中存在的Dzyaloshinskii-Moriya(DM)相互作用,可以导致新颖的自旋纹理和奇异的手性物理现象.而如果能在中心对称的晶格中发现DM相互作用,这将可以大大丰富实现上述新奇物理的材料体系.本文发现中心对称的且遵循非简单空间群结构的巡游电子体系可以作为实现DM相互作用的新平台.以遵循P4/nmn空间群的晶格为例,作者展示了在该中心对称晶格中,由巡游电子导致的Ruderman-Kittel-Kasuya-Yosida(RKKY)相互作用中包含DM相互作用、Heisenberg交换相互作用和Kaplan-Shekhtman-Entin-wohlman-Aharony(KSEA)相互作用.在这其中,DM相互作用的DM矢量的方向取决于实空间中磁性原子的位置,DM相互作用的强度取决于动量空间中费米面的位置.该晶格体系中磁性相互作用的多样性,源于非简单空间群对称性保证的实空间中位置依赖的在位点群和倒空间中动量依赖的电子结构.本研究揭示了非简单空间群对称性如何影响晶体中的磁性,表明非简单空间群晶格体系是设计磁性相互作用非常有前景的平台.

关键词：巡游电子中心对称物理现象动量空间费米面磁性原子

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Unification of valley and anomalous Hall effects in a strained lattice

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Physical Review B 2021年第3期104卷 035410-035410页

作者： Jiale Yuan Han Cai Congjun Wu Shi-Yao Zhu Ren-Bao Liu Da-Wei Wang Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Device and Department of Physics Zhejiang University Hangzhou 310027 China School of Science Westlake University Hangzhou 310024 China Key Laboratory for Quantum Materials of Zhejiang Province School of Science Westlake University Hangzhou 310024 China Department of Physics Centre for Quantum Coherence and The Hong Kong Institute of Quantum Information Science and Technology The Chinese University of Hong Kong Shatin New Territories Hong Kong China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

Two-dimensional lattices are an important stage for studying many aspects of quantum physics, in particular the topological phases. The valley Hall and anomalous Hall effects are two representative topological phenomena. Here we show that they can be unified in a strained honeycomb lattice, where the hopping strengths between neighboring sites are designed by mimicking those between the Fock states in a three-mode Jaynes-Cummings model. Such a strain induces an effective magnetic field, which results in quantized Landau levels. The eigenstates in the zeroth Landau level can be represented by the eigenstates of a large pseudo-spin. We find that the valley Hall current and the chiral edge current in the Haldane model correspond to the pseudo-spin precession around different axes. Our study sheds light on connection between seemingly unrelated topological phases in condensed matter physics.

关键词： Cavity quantum electrodynamics Edge states Landau levels Quantum anomalous Hall effect Valleytronics Honeycomb lattice Jaynes-Cummings model Second quantization

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Perfect crossed Andreev reflection in the proximitized graphene/superconductor/proximitized graphene junctions

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Physical Review B 2023年第13期108卷 134511-134511页

作者： Shu-Chang Zhao Lu Gao Qiang Cheng Qing-Feng Sun School of Science Qingdao University of Technology Qingdao Shandong 266520 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Hefei National Laboratory Hefei 230088 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

We study the crossed Andreev reflection and the nonlocal transport in the proximitized graphene/ superconductor/proximitized graphene junctions with the pseudospin staggered potential and the intrinsic spin-orbit coupling. The crossed Andreev reflection with the local Andreev reflection and the elastic cotunneling being completely eliminated can be realized for the electrons with the specific spin-valley index when the intrinsic spin-orbit couplings in the left graphene and the right graphene possess the opposite sign. The perfect crossed Andreev reflection with its probability equal to 100% can be obtained in the space consisting of the incident angle and the energy of the electrons. The crossed conductance and its oscillation with the superconductor length are also investigated. The energy ranges for the crossed Andreev reflection without the local Andreev reflection and the elastic cotunneling are clarified for the different magnitudes of the pseudospin potential and the spin-orbit coupling. The spin-valley index of the electrons responsible for the perfect crossed Andreev reflection can be switched by changing the sign of the intrinsic spin-orbit coupling or exchanging the biases applied on the left graphene and the right graphene. Our results are helpful for designing the flexible and high-efficiency Cooper pair splitter based on the spin-valley degree of freedom.

关键词： Andreev reflection Quantum transport Spin-singlet pairing Graphene

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Strong decays of excited 2+ charmed mesons

arXiv

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arXiv 2022年

作者： Tan, Xiao-Ze Wang, Tianhong Jiang, Yue Li, Qiang Huo, Lei Wang, Guo-Li School of Physics Harbin Institute of Technology Harbin150001 China School of Physical Science and Technology Northwestern Polytechnical University Xi'An710129 China Department of Physics Hebei University Baoding071002 China Hebei Key Laboratory of High-Precision Computation and Application of Quantum Field Theory Baoding071002 China

The new charmed resonance D2∗(3000) was observed by the LHCb Collaboration in B decays. In this paper, by assigning it as four possible excited states of the 2+ family, we use the instantaneous Bethe-Salpeter method to calculate their Okubo-Zweig-Iizuka-allowed two-body strong decays. The results of 13F2 and 33P2 states deviate from the present experimental observation while 23P2 and 23F2 are in the error range. Our study also reveals that the widths of these states depend strongly on the masses. Due to the large uncertainties and different mass input, variable models get inconsistent conclusions at the moment. The analysis in this work can provide essential assistance for future measurements and investigations. Copyright © 2022, The Authors. All rights reserved.

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Dual-fermion approach to interacting disordered fermion systems

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Physical Review B 2014年第19期89卷 195116-195116页

作者： S.-X. Yang P. Haase H. Terletska Z. Y. Meng T. Pruschke J. Moreno M. Jarrell Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Center for Computation and Technology Louisiana State University Baton Rouge Louisiana 70803 USA Department of Physics University of Göttingen 37077 Göttingen Germany Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA

We generalize the recently introduced dual-fermion (DF) formalism for disordered fermion systems by including the effect of interactions. For an interacting disordered system the contributions to the full vertex function have to be separated into crossing-asymmetric and crossing-symmetric scattering processes, and addressed differently when constructing the DF diagrams. By applying our approach to the Anderson-Falicov-Kimball model and systematically restoring the nonlocal correlations in the DF lattice calculation, we show a significant improvement over the dynamical mean-field theory and the coherent potential approximation for both one-particle and two-particle quantities.

关键词： FERMIONS PARTICLES (Nuclear physics) QUANTUM statistics CONDENSED matter CONDENSED matter physics

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Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot

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Physical Review Applied 2022年第4期17卷 044052-044052页

作者： He Liu Ting Zhang Ke Wang Fei Gao Gang Xu Xin Zhang Shu-Xiao Li Gang Cao Ting Wang Jianjun Zhang Xuedong Hu Hai-Ou Li Guo-Ping Guo CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei Anhui 230026 China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Institute of Physics and CAS Center for Excellence in Topological Quantum Computation Chinese Academy of Sciences Beijing 100190 China Department of Physics University at Buffalo SUNY Buffalo New York 14260 USA Origin Quantum Computing Company Limited Hefei Anhui 230026 China

Hole spins confined in semiconductor quantum dot systems have gained considerable interest for their strong spin-orbit interactions (SOIs) and relatively weak hyperfine interactions. Here, we experimentally demonstrate a tunable SOI in a double quantum dot in a germanium (Ge) hut wire (HW), which could help to enable fast all-electric spin manipulations while suppressing unwanted decoherence. Specifically, we measure the transport spectra in the Pauli-spin-blockade regime in the double-quantum-dot device. By adjusting the interdot tunnel coupling, we obtain an electric-field-tuned spin-orbit length of lSO= 2.0–48.9 nm. This tunability of the SOI could pave the way toward the realization of high-fidelity qubits in Ge HW systems.

关键词： Quantum information with solid state qubits Spin blockade Spin relaxation Spin-orbit coupling Double quantum dots Elemental semiconductors Nanowires Resistivity measurements

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Weak localization and crossover from Lifshitz transition in two dimensions

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Physical Review B 2021年第15期104卷 155135-155135页

作者： Kai-He Ding Zhen-Gang Zhu Yong-Le Hu Gang Su Department of Physics and Electronic Science Changsha University of Science and Technology Changsha 410076 China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering Changsha University of Science and Technology Changsha 410076 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing 100049 China Theoretical Condensed Matter Physics and Computational Materials Physics Laboratory College of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China College of Automobile and Mechanical Engineering Changsha University of Science and Technology Changsha 410076 China Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Beijing 100049 China

Dirac point plays a crucial role in regulating electronic properties of topological semimetals. In two dimensions, the manipulation of Dirac points can spur a transition from Dirac semimetal through semi-Dirac phase to a gapped phase. Across such a so-called Lifshitz transition, we find that the quantum interference corrections to the conductivity δσxx and δσyy are always negative, giving rise to a weak localization behavior. The ratio δσxx/δσyy undergoes a transition from linear to parabolic dependence on the merging parameter across the Lifshitz transition, which leads to a crossover of the temperature dependence of the inverse inelastic scattering time 1/τɛ from ∼T to ∼Tln(T0/T). This fingerprint behavior can be readily tested experimentally through merging Dirac points in two-dimensional lattices. This work presents an alternative perspective to understand weak localization through Lifshitz transition.

关键词： Topological phases of matter Weak localization Dirac semimetal Disordered systems Two-dimensional electron system

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Tunable Mode Coupling in Nanocontact Spin-Torque Oscillators

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Physical Review Applied 2017年第1期8卷 014034-014034页

作者： Steven S.-L. Zhang Ezio Iacocca Olle Heinonen Department of Physics and Astronomy University of Missouri Columbia Missouri 65211 USA Material Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Applied Mathematics University of Colorado Boulder Colorado 80309-0526 USA Department of Physics Division for Theoretical Physics Chalmers University of Technology 412 96 Gothenburg Sweden Northwestern-Argonne Institute of Science and Technology 2145 Sheridan Road Evanston Illinois 60208 USA Computation Institute The University of Chicago 5735 South Ellis Avenue Chicago Illinois 60637 USA

Recent experiments on spin-torque oscillators have revealed interactions between multiple magnetodynamic modes, including mode coexistence, mode hopping, and temperature-driven crossover between modes. The initial multimode theory indicates that a linear coupling between several dominant modes, arising from the interaction of the subdynamic system with a magnon bath, plays an essential role in the generation of various multimode behaviors, such as mode hopping and mode coexistence. In this work, we derive a set of rate equations to describe the dynamics of coupled magnetodynamic modes in a nanocontact spin-torque oscillator. Expressions for both linear and nonlinear coupling terms are obtained, which allow us to analyze the dependence of the coupled dynamic behaviors of modes on external experimental conditions as well as intrinsic magnetic properties. For a minimal two-mode system, we further map the energy and phase difference of the two modes onto a two-dimensional phase space and demonstrate in the phase portraits how the manifolds of periodic orbits and fixed points vary with an external magnetic field as well as with the temperature.

关键词： Spin transfer torque Spin waves Spintronics Spin valves Landau-Lifschitz-Gilbert equation

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How to understand the X(2900)?

arXiv

引用

arXiv 2021年

作者： Wang, Bo Zhu, Shi-Lin School of Physical Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding071002 China School of Physics Center of High Energy Physics Peking University Beijing100871 China

In this work, the S- and P-wave D¯∗K∗ interactions are studied in a coupled-channel formalism to understand the recently observed X0(2900) and X1(2900) at LHCb. The experimental event distributions can be well described, and two states with I(JP) = 0(0+) and 0(1−) are yielded in a unified framework. The masses of the 0+ and 1− states are consistent with the experimental data, but the width of the 0+ state is larger than that of the 1− one. The X1(2900) can be interpreted as the P-wave excitation of the ground-state X0(2900) in the hadronic molecular picture. The S- and P-wave multiplets in the D¯∗K∗ system have many members, so the present peak in the D−K+ invariant mass distributions might contain multi substructures. © 2021, CC BY.

关键词： Seismic waves

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