检索结果-内蒙古大学图书馆

Ferroelectricity-driven metallicity and magnetic skyrmions in the van der Waals Cr2Ge2Te6/Hf2Ge2Te6 multiferroic heterostructure

引用

Physical Review B 2025年第14期111卷 144418-144418页

作者： Zheng Chen Hongliang Hu Xiaoping Wu Wenjun Zhang Ping Li Changsheng Song Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou 310018 China and Longgang Institute of Zhejiang Sci-Tech University Wenzhou 325802 China

Two-dimensional (2D) multiferroic heterostructures present a promising platform for advanced spin devices by leveraging the coexisting ferromagnetic and ferroelectric orders. Through first-principles calculations and atomistic simulations, we reveal nonvolatile control of metallicity and topological spin textures in the Cr2Ge2Te6/Hf2Ge2Te6 (CGT/HGT) heterostructure. Notably, manipulating ferroelectric polarization in HGT significantly modulates the magnetic anisotropy energy and Dzyaloshinskii-Moriya interaction of CGT/HGT, reversing the easy magnetization axis from in plane to out of plane. By analyzing the atomic-resolved spin-orbit-coupling energy (ΔEsoc), it is found that the cause of the change comes from the Fert-Levy mechanism. Additionally, this polarization control enables the creation and annihilation of bimerons and skyrmions, with interlayer sliding further altering magnetic ordering. Our findings offer valuable insights into magnetoelectric coupling and spin texture manipulation in 2D magnets, highlighting their potential for next-generation spintronic and memory devices.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Optimal Estimation of Temperature

arXiv

引用

arXiv 2025年

作者： Zhang, Shaoyong Fei, Zhaoyu Wang, Xiaoguang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University 928 Second Avenue Xiasha Higher Education Zone Zhejiang province Hangzhou310018 China

Over the past century, the Boltzmann entropy has been widely accepted as the standard definition of entropy for an isolated system. However, it coexists with controversial alternatives, such as the Gibbs entropy. These definitions, including the Boltzmann entropy, exhibit certain inconsistencies, both mathematically and thermodynamically. To address this challenge, we introduce the estimation theory in statistical inference into the study of thermodynamics and statistical physics for finite-sized systems. By regarding the finite-sized system as a thermometer used to measure the temperature of the heat reservoir, we show that optimal estimation of temperature yields the corresponding entropy formula for an isolated system. In the single-sample case, optimal estimation of inverse temperature (or temperature) corresponds to the Boltzmann entropy (or Gibbs entropy). These different definitions of entropy, rather than being contradictory, apply to optimal estimation of different parameters. Furthermore, via the Laplace transform, we identify a complementarity between estimation of temperature and system's energy, a concept suggested by Niels Bohr. We also correct the energy-temperature uncertainty relation, as expressed by the Cramér-Rao bound, in the large-N limit. In the multiplesample case, we generalize the definitions of both Boltzmann entropy and Gibbs entropy to achieve optimal estimation of temperature, revealing the tight connection between statistical inference and Terrell Hill's nanothermodynamics. © 2025, CC BY.

关键词： Cramer-Rao bounds

来源：评论

学校读者我要写书评

暂无评论

Necessity of orthogonal basis vectors for the two-anyon problem in a one-dimensional lattice

引用

Communications in Theoretical Physics 2024年第12期76卷 60-72页

作者： Cuicui Zheng Jiahui Xie Ming Zhang Yajiang Chen Yunbo Zhang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China

Few-body physics for anyons has been intensively studied within the anyon-Hubbard model,including the quantum walk and Bloch oscillations of two-anyon ***,theoretical and experimental simulations of two-anyon states in a one-dimensional lattice have been carried out by expanding the wavefunction in terms of non-orthogonal basis vectors,resulting in nonphysical degrees of *** the present work,we deduce finite difference equations for the two-anyon state in a one-dimensional lattice by solving the Schr?dinger equation with orthogonal and complete basis *** an orthogonal scheme gives all the orthogonal physical eigenstates,while the conventional(non-orthogonal)method produces many nonphysical redundant eigensolutions whose components violate the anyonic commutation *** dynamical property of the two-anyon states in a sufficiently large lattice is investigated and compared in both the orthogonal and conventional *** initial states with two anyons at the same site or two(next-)neighboring sites,we observe the same dynamical behavior in both schemes,including the revival probability,probability density function and two-body *** other initial states,the conventional scheme produces erroneous states that no longer obey the anyonic *** period of Bloch oscillations in the pseudo-fermionic limit has been found to be twice that in the bosonic limit,while these oscillations disappear at other statistical *** findings are vital for quantum simulations of few-body anyonic physics in lattice models.

关键词： anyon-Hubbard model quantum walk Bloch oscillations two-anyon states quantum simulation

来源：评论

学校读者我要写书评

暂无评论

Electrically-Driven and Exponentially-Enhanced Spin-Photon Interfaces for quantum Networks

arXiv

引用

arXiv 2024年

作者： Hong, Fang-Yu Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Zhejiang Hangzhou310018 China

We present an electrically-driven scheme for spin-photon quantum interfaces used in quantum networks. Through modulating the motion of a nano cantilever with voltages, optomechanical coupling and spin-mechanical coupling can be exponentially enhanced simultaneously. Numerical simulations show that by applying well-designed voltages high-fidelity quantum interface operations such as generation and absorption of a single-photon with a known wave packet are within the reach of current techniques. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

Ferroelectricity-Driven Metallicity and Magnetic Skyrmions in van der Waals Cr2Ge2Te6/Hf2Ge2Te6 Multiferroic Heterostructure

arXiv

引用

arXiv 2024年

作者： Chen, Zheng Hu, Hongliang Wu, Xiaoping Zhang, Wenjun Li, Ping Song, Changsheng Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China College of Physics and Information Engineering Shanxi Normal University Taiyuan030031 China College of Science Xinjiang Institute of Technology Xinjiang735400 China Longgang Institute of Zhejiang Sci-Tech University Wenzhou China

Two-dimensional (2D) multiferroic heterostructures present a promising platform for advanced spin devices by leveraging the coexisting ferromagnetic (FM) and ferroelectric (FE) orders. Through first-principles calculations and atomistic simulations, we reveal non-volatile control of metallicity and topological spin textures in the Cr2Ge2Te6/Hf2Ge2Te6 (CGT/HGT) heterostructure. Notably, manipulating ferroelectric polarization in HGT significantly modulates the magnetic anisotropy energy (MAE) and Dzyaloshinskii-Moriya interaction (DMI) of CGT/HGT, reversing the easy magnetization axis from in-plane to out-of-plane. By analyzing the atomic-resolved SOC energy (∆Esoc), it is found that the cause of the change comes from the Fert-Levy mechanism. Additionally, this polarization control enables the creation and annihilation of bimerons and skyrmions, with interlayer sliding further altering magnetic ordering. Our findings offer valuable insights into magnetoelectric coupling and spin texture manipulation in 2D magnets, highlighting their potential for next-generation spintronic and memory devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

New Ga63(p,γ)Ge64 and Ge64(p,γ)As65 reaction rates corresponding to the temperature regime of thermonuclear x-ray bursts

引用

Physical Review C 2024年第6期110卷 065804-065804页

作者： Ning Lu (盧寧) Yi Hua Lam (藍乙華) Alexander Heger Zi Xin Liu (刘子鑫) Hidetoshi Yamaguchi (山口英斉) CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Astrophysical Big Bang Laboratory (ABBL) Cluster for Pioneering Research RIKEN Wako Saitama 351-0198 Japan Present address: Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University 310018 Hangzhou China. School of Physics and Astronomy Monash University Vic 3800 Australia OzGrav-Monash – Monash Centre for Astrophysics School of Physics and Astronomy Monash University Vic 3800 Australia Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) School of Physics and Astronomy Monash University Vic 3800 Australia Joint Institute for Nuclear Astrophysics Michigan State University East Lansing Michigan 48824 USA Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000 China Center for Nuclear Study (CNS) the University of Tokyo RIKEN campus 2-1 Hirosawa Wako Saitama 351-0198 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo 181-8588 Japan

We compute the Ga63(p,γ)Ge64 and Ge64(p,γ)As65 thermonuclear reaction rates using the latest experimental input supplemented with theoretical nuclear spectroscopic information. The experimental input consists of the latest proton thresholds of Ge64 and As65 and the nuclear spectroscopic information of As65, whereas the theoretical nuclear spectroscopic information for Ge64 and As65 are deduced from the full pf-shell space configuration-interaction shell-model calculations with the GXPF1A Hamiltonian. Both thermonuclear reaction rates are determined with known uncertainties at the energies that correspond to the Gamow windows of the temperature regime relevant to type I x-ray bursts, covering the typical temperature range of the thermonuclear runaway of the GS 1826−24 periodic bursts and SAX J1808.4−3658 photospheric radius expansion bursts.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：