检索结果-内蒙古大学图书馆

Physical Review B 2021年第8期103卷 L081402-L081402页

作者： Xiao-Ping Li Ke Deng Botao Fu YongKai Li Da-Shuai Ma JunFeng Han Jianhui Zhou Shuyun Zhou Yugui Yao Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences (CAS) Hefei 230031 Anhui China Frontier Science Center for Quantum Information Beijing 100084 China

Weyl semimetals have been classified into type I and type II with respect to the geometry of their Fermi surfaces at the Weyl points. we propose another class of Weyl semimetal, whose unique Fermi surface contains two electron or two hole pockets touching at a multi-Weyl point, dubbed a type-III Weyl semimetal. Based on first-principles calculations, we first show that the quasi-one-dimensional compound (TaSe4)2I is a type-III Weyl semimetal with larger chiral charges. (TaSe4)2I can support fourfold helicoidal surface states with long Fermi arcs on the (001) surface. Angle-resolved photoemission spectroscopy measurements are in agreement with the gapless nature of (TaSe4)2I at room temperature and reveal its characteristic dispersion. In addition, our calculations show that external strain could induce transitions in (TaSe4)2I among the type-III, type-II, and type-I Weyl semimetals, accompanied with the Lifshitz transitions of the Fermi surfaces. Therefore, our work experimentally indicates (TaSe4)2I as a type-III Weyl semimetal and provides a promising platform to further investigate the physics of type-III Weyl fermions.

关键词： Electronic structure First-principles calculations Surface states Topological materials Topological phases of matter

来源：评论

学校读者我要写书评

暂无评论

Universally Robust quantum Control

引用

Physical Review Letters 2024年第19期132卷 193801-193801页

作者： Pablo M. Poggi Gabriele De Chiara Steve Campbell Anthony Kiely Department of Physics SUPA and University of Strathclyde Glasgow G4 0NG United Kingdom Center for Quantum Information and Control Department of Physics and Astronomy University of New Mexico Albuquerque New Mexico 87131 USA Centre for Quantum Materials and Technology School of Mathematics and Physics Queen’s University Belfast Belfast BT7 1NN United Kingdom School of Physics University College Dublin Belfield Dublin 4 Ireland Centre for Quantum Engineering Science and Technology University College Dublin Belfield Dublin 4 Ireland Dahlem Center for Complex Quantum Systems Freie Universität Berlin Arnimallee 14 14195 Berlin Germany

We study the robustness of the evolution of a quantum system against small uncontrolled variations in parameters in the Hamiltonian. We show that the fidelity susceptibility, which quantifies the perturbative error to leading order, can be expressed in superoperator form and use this to derive control pulses that are robust to any class of systematic unknown errors. The proposed optimal control protocol is equivalent to searching for a sequence of unitaries that mimics the first-order moments of the Haar distribution, i.e., it constitutes a 1-design. We highlight the power of our results for error-resistant single- and two-qubit gates.

关键词： Open quantum systems & decoherence quantum control quantum state transfer

来源：评论

学校读者我要写书评

暂无评论

Design monolayer iodinenes based on halogen bond and tiling theory

引用

Physical Review B 2024年第12期109卷 125423-125423页

作者： Kejun Yu Yichen Liu Botao Fu Run-Wu Zhang Da-shuai Ma Xiao-ping Li Zhi-Ming Yu Cheng-Cheng Liu Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Institute for Structure and Function and Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing University Chongqing 400044 People's Republic of China Center of Quantum Materials and Devices Chongqing University Chongqing 400044 People's Republic of China School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China

Xenes, two-dimensional (2D) monolayers composed of a single element, with graphene as a typical representative, have attracted widespread attention. Most of the previous Xenes, X from group-IIIA to group-VIA elements, have bonding characteristics of covalent bonds. In this paper, we unveil the pivotal role of a halogen bond, which is a distinctive type of bonding with interaction strength between that of a covalent bond and a van der Waals interaction, in 2D group-VIIA monolayers. Combing the ingenious non-edge-to-edge tiling theory and state-of-the-art ab initio method with refined local density functional M06-L, we provide a precise and effective bottom-up construction of 2D iodine monolayer sheets, iodinenes, primarily governed by halogen bonds, and successfully design a category of stable iodinenes encompassing herringbone, Pythagorean, gyrated truncated hexagonal, i.e., diatomic kagome, and gyrated hexagonal tiling patterns. These iodinene structures exhibit a wealth of properties, such as nontrivial topology, flat bands and fascinating optical characteristics, offering valuable insights and guidance for future experimental investigations. Our paper not only unveils the unexplored halogen bonding mechanism in 2D materials but also opens an avenue for designing other noncovalent bonding 2D materials.

关键词： Electronic structure Structural properties Topological materials 2-dimensional systems Two-dimensional electron system Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Prediction of intrinsic topological superconductivity in Mn-doped GeTe monolayer from first-principles

引用

npj Computational Materials 2021年第1期7卷 406-413页

作者： Xiaoming Zhang Kyung-Hwan Jin Jiahao Mao Mingwen Zhao Zheng Liu Feng Liu Department of Physics College of Information Science and EngineeringOcean University of ChinaQingdaoShandongChina Institute for Advanced Study Tsinghua UniversityBeijingChina Department of Materials Science and Engineering University of UtahSalt Lake CityUtahUSA Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science(IBS)PohangRepublic of Korea Department of Physics Pohang University of Science and TechnologyPohangRepublic of Korea State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijingChina School of Physics and State Key Laboratory of Crystal Materials Shandong UniversityJinanShandongChina

The recent discovery of topological superconductors(TSCs)has sparked enormous *** realization of TSC requires a delicate tuning of multiple microscopic parameters,which remains a great ***,we develop a first-principles approach to quantify realistic conditions of TSC by solving self-consistently Bogoliubov-de Gennes equation based on a Wannier function construction of band structure,in presence of Rashba spin-orbit coupling,Zeeman splitting and electron-phonon *** further demonstrate the power of this method by predicting the Mn-doped GeTe(Ge_(1-x)Mn_(x)Te)monolayer—a well-known dilute magnetic semiconductor showing superconductivity under hole doping—to be a Class D TSC with Chern number of−1 and chiral Majorana edge *** constructing a first-principles phase diagram in the parameter space of temperature and Mn concentration,we propose the TSC phase can be induced at a lower-limit transition temperature of~40 mK and the Mn concentration of x~0.015%.Our approach can be generally applied to TSCs with a phonon-mediated pairing,providing useful guidance for future experiments.

关键词： topological principles monolayer

来源：评论

学校读者我要写书评

暂无评论

Mediated Interaction between Ions in quantum Degenerate Gases

引用

Physical Review Letters 2022年第15期129卷 153401-153401页

作者： Shanshan Ding Michael Drewsen Jan J. Arlt G. M. Bruun Center for Complex Quantum Systems Department of Physics and Astronomy Aarhus University Ny Munkegade DK-8000 Aarhus C Denmark Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China

We explore the interaction between two trapped ions mediated by a surrounding quantum degenerate Bose or Fermi gas. Using perturbation theory valid for weak atom-ion interaction, we show analytically that the interaction mediated by a Bose gas has a power-law behavior for large distances whereas it has a Yukawa form for intermediate distances. For a Fermi gas, the mediated interaction is given by a power law for large density and by a Ruderman-Kittel-Kasuya-Yosida form for low density. For strong atom-ion interaction, we use a diagrammatic theory to demonstrate that the mediated interaction can be a significant addition to the bare Coulomb interaction between the ions, when an atom-ion bound state is close to threshold. Finally, we show that the induced interaction leads to substantial and observable shifts in the ion phonon frequencies.

关键词： Bose-Einstein condensates Fermi gases Scattering of atoms, molecules, clusters & ions Scattering theory Ultracold collisions Ions Feynman diagrams Perturbative methods

来源：评论

学校读者我要写书评

暂无评论

In situ TEM revealing the effects of dislocations on lithium-ion migration in transition metal dichalcogenides

引用

Journal of Energy Chemistry 2021年第7期30卷 280-284页

作者： Ruiwen Shao Chengkai Yang Chen Yang Shulin Chen Weikang Dong Bairong Li Xiumei Ma Jing Lu Lixin Dong Peng Gao Dapeng Yu Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Convergence in Medicine and Engineering Beijing Institute of TechnologyBeijing 100081China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina State Key Laboratory for Artiﬁcial Microstructure&Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Analysis and Testing Center Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Biomedical Engineering City University of Hong KongHong KongChina International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Department of Physics South University of Science and Technology of ChinaShenzhen 518055GuangdongChina

The two-dimensional (2D) structure of layered transition metal dichalcogenides (TMDs) provides unusual physical properties [1,2]and chemical reactivity [3,4], which can be influenced by defects such as dislocations [5,6]. For example, dislocations can act as nucleation sites for the onset of deformation when subjected to stress [7].

关键词： Batteries Defect Structure–property relationships Electrodes Transition metal dichalcogenides

来源：评论

学校读者我要写书评

暂无评论

Deterministic high-rate entanglement distillation with neutral atom arrays

arXiv

引用

arXiv 2025年

作者： Hahn, Thomas A. White, Ryan Bernien, Hannes Arnon-Friedman, Rotem The Center for Quantum Science and Technology Department of Physics of Complex Systems Weizmann Institute of Science Rehovot Israel Department of Physics University of Chicago ChicagoIL60637 United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States

The goal of an entanglement distillation protocol is to convert large quantities of noisy entangled states into a smaller number of high-fidelity Bell pairs. The celebrated one-way hashing method is one such protocol, and it is known for being able to efficiently and deterministically distill entanglement in the asymptotic limit, i.e., when the size of the quantum system is very large. In this work, we consider setups with finite resources, e.g., a small fixed number of atoms in an atom array, and derive lower bounds on the distillation rate for the one-way hashing method. We provide analytical as well as numerical bounds on its entanglement distillation rate – both significantly tighter than previously known bounds. We then show how the one-way hashing method can be efficiently implemented with neutral atom arrays. The combination of our theoretical results and the experimental blueprint we provide indicate that a full coherent implementation of the one-way hashing method is within reach with state-of-the-art quantum technology. Copyright © 2025, The Authors. All rights reserved.

关键词： Atoms

来源：评论

学校读者我要写书评

暂无评论

Mobile impurity probing a two-dimensional superfluid phase transition

引用

Physical Review A 2022年第6期105卷 063303-063303页

作者： R. Alhyder G. M. Bruun Center for Complex Quantum Systems Department of Physics and Astronomy Aarhus University Ny Munkegade 120 DK-8000 Aarhus C Denmark Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China

The use of atomically sized quantum systems as highly sensitive measuring devices represents an exciting and quickly growing research field. Here we explore the properties of a quasiparticle formed by a mobile impurity interacting with a two-dimensional fermionic superfluid. The energy of the quasiparticle is shown to be lowered by superfluid pairing, as this increases the compressibility of the Fermi gas, thereby making it easier for the impurity to perturb its surroundings. We demonstrate that the fundamentally discontinuous nature of the superfluid-to-normal phase transition of a two-dimensional system leads to a rapid increase in the quasiparticle energy around the critical temperature. The magnitude of this increase exhibits a nonmonotonic behavior as a function of the pairing strength with a sizable maximum in the crossover region, where the spatial extend of the Cooper pairs is comparable to the interparticle spacing. Since the quasiparticle energy is measurable with present experimental techniques, our results illustrate how impurities entangled with their environment can serve as useful probes for nontrivial thermal and quantum correlations.

关键词： Fermi gases Polarons Superfluidity 2-dimensional systems Many-body techniques

来源：评论

学校读者我要写书评

暂无评论

Twisted single photon source with high-purity and tunability

Twisted single photon source with high-purity and tunability

引用

Optica quantum 2.0 Conference and Exhibition, quantum 2.0

作者： Zhao, Haoqi Ma, Yichen Gao, Zihe Liu, Na Wu, Tianwei Wu, Shuang Feng, Xilin Hone, James Strauf, Stefan Feng, Liang Department of Electrical and Systems Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Physics Stevens Institute of Technology HobokenNJ07030 United States Center for Quantum Science and Engineering Stevens Institute of Technology HobokenNJ07030 United States Department of Mechanical Engineering Columbia University New YorkNY10027 United States

ISBN: (纸本)9781957171272

Twisted single photons, carrying orbital angular momentum (OAM), could address the growing demand for high-dimensional quantum information encoding and transmission. By hybrid integration of two-dimensional semiconductor WSe2 with a spin-orbit-coupled microring resonator, we demonstrate a twisted single photon source with the ability to precisely define and switch between highly pure spin-OAM states. © 2023 The Author(s)

关键词： Electron beam lithography quantum key distribution quantum light sources Ring resonators Spatial light modulators Whispering gallery modes

来源：评论

学校读者我要写书评

暂无评论

Spatial calibration of high-density absorption imaging

arXiv

引用

arXiv 2024年

作者： Vibel, Toke Christensen, M.B. Kristensen, M.A. Thuesen, J.J. Stokholm, L.N. Weidner, C.A. Arlt, J.J. Center for Complex Quantum Systems Department of Physics and Astronomy Aarhus University Ny Munkegade 120 Aarhus CDK-8000 Denmark Quantum Engineering Technology Laboratories H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1FD United Kingdom

The accurate determination of atom numbers is an ubiquitous problem in the field of ultracold atoms. For modest atom numbers, absolute calibration techniques are available, however, for large numbers and high densities, the available techniques neglect many-body scattering processes. Here, a spatial calibration technique for time-of-flight absorption images of ultracold atomic clouds is presented. The calibration is obtained from radially averaged absorption images and we provide a practical guide to the calibration process. It is shown that the calibration coefficient scales linearly with optical density and depends on the absorbed photon number for the experimental conditions explored here. This allows for the direct inclusion of a spatially dependent calibration in the image analysis. For typical ultracold atom clouds the spatial calibration technique leads to corrections in the detected atom number up to ≈ 12 % and temperature up to ≈ 14 % in comparison to previous calibration techniques. The technique presented here addresses a major difficulty in absorption imaging of ultracold atomic clouds and prompts further theoretical work to understand the scattering processes in ultracold dense clouds of atoms for accurate atom number calibration. © 2024, CC BY.

关键词： Calibration

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：