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arXiv 2025年

作者： Liu, Cheng Liu, Yu-Hong Kuang, Le-Man Nori, Franco Liao, Jie-Qiao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Hunan Research Center of the Basic Discipline for Quantum Effects and Quantum Technologies Hunan Normal University Changsha410081 China Quantum Computing Center RIKEN Saitama Wakoshi351-0198 Japan Department of Physics The University of Michigan Ann ArborMI48109-1040 United States Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

Highly efficient transfer of quantum resources including quantum excitations, states, and information on quantum networks is an important task in quantum information science. Here, we propose a bipartite-graph framework for studying quantum excitation transfer in bosonic networks by diagonalizing the intermediate sub-network between the sender and the receiver to construct a bipartite-graph configuration. We examine the statistical properties of the bosonic networks in both the original and bipartite-graph representations. In particular, we investigate quantum excitation transfer in both the finite and infinite intermediate-normal-mode cases, and show the dependence of the transfer efficiency on the network configurations and system parameters. We find the bound of maximally transferred excitations for various network configurations and reveal the underlying physical mechanisms. We also find that the dark-mode effect will degrade the excitation transfer efficiency. Our findings provide a new insight for the design and optimization of quantum networks. Copyright © 2025, The Authors. All rights reserved.

关键词： Graphic methods

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Defect engineering on the electronic and transport properties of one-dimensional armchair phosphorene nanoribbons

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Chinese Physics B 2020年第3期29卷 353-360页

作者： Huakai Xu Gang Ouyang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceSynergetic Innovation Center for Quantum Effects and Applications(SICQEA)Hunan Normal UniversityChangsha 410081China

We investigate the electronic and transport properties of one-dimensional armchair phosphorene nanoribbons(APNRs) containing atomic vacancies with different distributions and concentrations using ab initio density functional calculations. It is found that the atomic vacancies are easier to form and detain at the edge region rather than a random distribution through analyzing formation energy and diffusion barrier. The highly local defect states are generated at the vicinity of the Fermi level, and emerge a deep-to-shallow transformation as the width increases after introducing vacancies in ***, the electrical transport of APNRs with vacancies is enhanced compared to that of the perfect counterparts. Our results provide a theoretical guidance for the further research and applications of PNRs through defect engineering.

关键词： density-functional theory defect engineering armchair phosphorene nanoribbon non-equilibrium Green's function

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Thickness-dependent structural stability and transition in molybdenum disulfide under hydrostatic pressure

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Chinese Physics B 2020年第8期29卷 386-392页

作者： Jiansheng Dong Gang Ouyang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceSynergetic Innovation Center for Quantum Effects and Applications(SICQEA)Hunan Normal UniversityChangsha 410081China

Understanding the physical mechanism of structural stability and transition in various polytypes of layered transition metal dichalcogenides under the external stimulus is of crucial importance for their new ***,we investigate the thickness-dependent structural properties of MoS2 under the condition of hydrostatic pressure in terms of bond relaxation and thermodynamics *** both types of MoS2 structures,we find that the transition and metallization are significantly modulated by hydrostatic pressure and the number of *** establish a pressure-size phase diagram to address the transition *** study not only provides insights into the thickness-dependent structural properties of MoS2,but also shows a theoretical guidance for the design and fabrication of MoS2-based devices.

关键词： bond relaxation thickness effect layered transition metal dichalcogenides structural transition pressure modulation

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Anti-parity-time symmetry hidden in a damping linear resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 22-32页

作者： Xun-Wei Xu Jie-Qiao Liao Hui Jing Le-Man Kuang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China

Phase transition from the over-damping to under-damping states is a ubiquitous phenomenon in physical systems. However, what kind of symmetry is broken associated with this phase transition remains unclear. Here, we discover that this phase transition is determined by an anti-parity-time(anti-PT) symmetry hidden in a single damping linear resonator, which is significantly different from the conventional anti-PT-symmetric systems with two or more modes. We show that the breaking of the anti-PT symmetry yields the phase transition from the over-damping to under-damping states, with an exceptional point(EP) corresponding to the critical-damping state. Moreover, we propose an optomechanical scheme to show this anti-PT symmetry breaking by using the optical spring effect in a quadratic optomechanical system. We also suggest an optomechanical sensor with the sensitivity enhanced significantly around the EPs for the anti-PT symmetry breaking. Our work unveils the anti-PT symmetry hidden in damping oscillations and hence opens up new possibilities for exploiting wide anti-PT symmetry applications in single damping linear resonators.

关键词： anti-parity-time symmetry exceptional points damping linear resonator optomechanics

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Quantum routing of few photons using a nonlinear cavity coupled to two chiral waveguides

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Chinese Physics B 2022年第11期31卷 201-206页

作者： Jian-Shuang Liu Ya Yang Jing Lu Lan Zhou Affiliation Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China

We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear *** quantum states of scattered few photons are solved analytically via a real-space approach,and the solution indicates the few-photon reflection and transmission *** inputting two photons of equal energy to resonate with the cavity,the propagation characteristics of the two photons will be interesting,which is different from the previous anti-bunching effects with a quantum *** importantly,when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons,influence of the bound state will become larger to result in disappearance of antibunching ***,the bound state has no effect on probability of routing to another waveguide.

关键词： quantum routing few-photon scattering nonlinear cavity chirally couple

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Quantum phase transition of the Jaynes-Cummings model

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 1-9页

作者： Cheng Liu Jin-Feng Huang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsInstitute of Interdisciplinary StudiesHunan Normal UniversityChangsha 410081China

Herein,we propose an experimentally feasible scheme to show the quantum phase transition of the Jaynes-Cummings(JC)model by modulating the transition frequency of a two-level system in a quantum Rabi model with strong *** tuning the modulation frequency and amplitude,the ratio of the effective coupling strength of the rotating terms to the effective cavity(atomic transition)frequency can enter the deep-strong coupling regime,while the counter-rotating terms can be ***,a deep-strong JC model is *** ratio of the coupling strength to resonance frequencies in the deep-strong JC model is two orders of magnitude larger than the corresponding ratio in the original quantum Rabi *** scheme can be employed in atom-cavity resonance and off-resonance cases,and it is valid over a broad *** nonzero average cavity photons of the ground state indicate the emergence of a quantum phase ***,we demonstrate the dependence of the phase diagram on the atom-cavity detuning and modulation *** the parameters used in our scheme are within the reach of current experimental *** scheme provides a new mechanism for investigating the critical phenomena of finite-sized systems without requiring classical field limits,thereby opening a door for studying fundamental quantum phenomena occurring in the ultrastrong and even deep-strong coupling regimes.

关键词： Jaynes-Cummings model quantum phase transition frequency modulation

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Fringe visibility for two qubits interacting with a macroscopic medium

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Communications in Theoretical Physics 2020年第4期72卷 37-44页

作者： Yu-Heng Li Yan-Jun Liu Jing Lu Lan Zhou Department of Physics and Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal UniversityChangsha 410081China College of Physics Mechanical and Electronical CollegeShijiazhuang UniversityShijiazhuang050035HebeiChina

We study both the two-particle and single-particle fringe visibility in the generalized version of the Nakazato–Pascazio model where two qubits interact with a finite length one-dimensional *** the two-particle and single-particle fringe visibilities are investigated with different initial states of the particles *** different initial states of the particles spin,the two-particle fringe visibility either decreases or increases over time,and may even decrease first and increase *** to the interaction between the particles and the one-dimensional array,the single-particle fringe visibility increases over time when the initial state of the two particles spin is *** single-particle fringe visibility is equal to 0 as the two-particle spin is initially in the completely entangled state or in the singlet state.

关键词： two-particle fringe visibility single-particle fringe visibility Nakazato-Pascazio generalized model

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Interface modulated electron mobility enhancement in core–shell nanowires

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Chinese Physics B 2022年第11期31卷 256-261页

作者： Yan He Hua-Kai Xu Gang Ouyang College of Science Guangdong University of Petrochemical TechnologyMaoming 525000China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China

The transport properties of core–shell nanowires(CSNWs)under interface modulation and confinement are investigated based on the atomic-bond-relaxation(ABR)correlation mechanism and Fermi’s golden *** analytical expression for the relationship between carrier mobility and interface mismatch strain is derived and the influence of size,shell thickness and alloyed layer on effective mass,band structures,and deformation potential constant are *** is found that interface modulation can not only reduce the lattice mismatch to optimize the band alignment,but also participate in the carrier transport for enhancing ***,the underlying mechanism regarding the interface shape dependence of transport properties in CSNWs is *** great enhancement of electron mobility suggests that the interface modulation may become a potential pathway to improving the performance of nanoelectronic devices.

关键词： core-shell nanowires interface modulated electron mobility

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Stability of spin dynamics in a driven non-Hermitian double well

arXiv

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arXiv 2025年

作者： Luo, Zhida Yang, Yurui Cui, Jiaxi Li, Wenjuan Lu, Miaoqian Hai, Wenhua Luo, Yunrong Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province School of Physics and Electronics Hunan Normal University Changsha410081 China School of Physics and Electronic Information Engineering Ningxia Normal University Ningxia Guyuan756000 China

We study the stability of spin dynamics for a spin-orbit (SO) coupled boson held in a driven non-Hermitian double-well potential. It is surprising to find that when the ratio of the Zeeman field strength to the driving frequency is even, the SO coupling strength can take any value, and suitable parameters can be found to stabilize the quantum spin dynamics of the system. However, when the ratio of the Zeeman field strength to the driving frequency is odd, the SO coupling strength can only take integer or half-integer values for the spin dynamics of the system to possibly be stable. © 2025, CC BY-NC-ND.

关键词： Spin dynamics

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Prediction of giant and ideal Rashba-type splitting in ordered alloy monolayers grown on a polar surface

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National Science Review 2021年第4期8卷 100-106页

作者： Mingxing Chen Feng Liu Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and Applications(SICQEA)School of Physics and Electronics Hunan Normal University Department of Materials Science and Engineering University of Utah

A large and ideal Rashba-type spin-orbit splitting is desired for the applications of materials in spintronic devices and the detection of Majorana fermions in solids. Here, we propose an approach to achieve giant and ideal spin-orbit splittings through a combination of ordered surface alloying and interface engineering,that is, growing alloy monolayers on an insulating polar surface. We illustrate this unique strategy by means of first-principle calculations of buckled hexagonal monolayers of Sb Bi and Pb Bi supported on Al2O3（0001）. Both systems display ideal Rashba-type states with giant spin-orbit splittings, characterized with energy offsets over 600 meV and momentum offsets over 0.3 ?-1, respectively. Our study thus points to an effective way of tuning spin-orbit splitting in low-dimensional materials to draw immediate experimental interest.

关键词： Rashba effect interface spin-orbit coupling

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