检索结果-南通市图书馆

topological and superconducting properties of monolayered CoN and CoP:A first-principles comparative study

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 98-108页

作者： Jiaqing Gao Zhenyu Zhang Ping Cui International Center for Quantum Design of Functional Materials(ICQD) Hefei National Research Center for Physical Sciences at Microscale(HFNL)University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Two-dimensional systems that simultaneously harbor superconductivity and nontrivial band topology may serve as appealing platforms for realizing topological superconductivity with promising applications in fault-tolerant quantum ***,based on first-principles calculations,we show that monolayered Co N and Co P with the isovalent Fe Se-like structure are stable in freestanding form,even though their known bulk phases have no resemblance to *** two systems are further revealed to display intrinsic band inversions due to crystal field splitting,and such orderings are preserved with the inclusion of spin-orbit coupling(SOC),which otherwise is able to open a curved band gap,yielding a non-zero Z2 topological invariant in each *** a mechanism of topologicalization is distinctly contrasted with that identified recently for the closely related monolayers of CoX(X=As,Sb,Bi),where the SOC plays an indispensable role in causing a nontrivial band ***,we demonstrate that,by applying equi-biaxial tensile strain,the electron-phonon coupling strength in monolayered CoN can be significantly enhanced,yielding a superconducting transition temperature(Tc)up to 7-12 K for the Coulomb pseudopotential ofμ*=0.2-0.1,while the CoP monolayer shows very low Tc even under pronounced *** different superconducting behaviors can be attributed to different variations in lattice softening and electronic density of states around the Fermi level upon *** central findings enrich the understanding of different mechanisms of band inversions and topologicalization and offer platforms for achieving the coexistence of superconductivity and nontrivial band topology based on two-dimensional systems.

关键词： topological yielding otherwise

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological superconductor candidates PdBi_(2)Te_(4) and PdBi_(2)Te_(5) from a generic ab initio strategy

引用

npj Computational Materials 2023年第1期9卷 400-406页

作者： Aiyun Luo Ying Li Yi Qin Jingnan Hu Xiaoxu Wang Jinyu Zou Biao Lian Gang Xu Wuhan National High Magnetic Field Center&School of Physics Huazhong University of Science and TechnologyWuhanChina Department of Physics Princeton UniversityPrincetonNJUSA Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhanChina Wuhan Institute of Quantum Technology WuhanChina

Superconducting topological metals(SCTMs)have recently emerged as a promising platform of topological superconductivity(TSC)and Majorana zero modes for quantum *** their importance in both fundamental research and applications,SCTMs are very rare in ***,we propose a strategy to design SCTMs by intercalating the superconducting units into the topological insulators.A program that characterizes the superconducting BdG Chern number of 2D BdG Hamiltonian from ab initio calculations is also *** this strategy,PdBi_(2)Te_(5) and PdBi_(2)Te_(4) are found to be experimentally synthesizable and ideal *** TSC could be realized in such SCTMs by incorporating topological surface states with Zeeman effect,which can be realized by an external magnetic field or in proximity to ferromagnetic *** strategy provides a new method for identifying the SCTMs and TSC candidates,and the program makes it possible to design and modulate the TSC candidates from ab initio calculations.

关键词： topological superconductor generic

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

topological Plasma Transport from a Diffusion View

引用

Chinese Physics Letters 2023年第11期40卷 25-30页

作者：刘周费黄吉平 Department of Physics State Key Laboratory of Surface Physicsand Key Laboratory of Micro and Nano Photonic Structures(MOE)Fudan UniversityShanghai 200438China

Recent studies have identified plasma as a topological ***,these researches often depict plasma as a fluid governed by electromagnetic fields,i.e.,a classical wave ***,plasma transport can be characterized by a unique diffusion process distinguished by its collective *** adopt a simplified diffusion-migration method to elucidate the topological plasma *** parallels to the thermal conduction-convection system,we introduce a double-ring model to investigate the plasma density behaviors in the anti-parity-time reversal(APT) unbroken and broken ***,by augmenting the number of rings,we have established a coupled ring chain *** structure serves as a medium for realizing the APT symmetric one-dimensional(1D) reciprocal model,representing the simplest tight-binding model with a trivial *** develop a model featuring topological properties,we should modify the APT symmetric 1D reciprocal model from the following two aspects:hopping amplitude and onsite *** the hopping amplitude,we incorporate the non-reciprocity to facilitate the non-Hermitian skin effect,an intrinsic non-Hermitian ***,from the onsite potential,the quasiperiodic modulation has been adopted onto the APT symmetric 1D reciprocal *** APT symmetric 1D Aubry–André–Harper model is of topological ***,we suggest the potential applications for these diffusive plasma topological *** study establishes a diffusion-based approach to realize topological states in plasma,potentially inspiring further advancements in plasma physics.

关键词： structure topological reciprocal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological hinge modes in Dirac semimetals

引用

Frontiers of physics 2023年第1期18卷 85-95页

作者： Xu-Tao Zeng Ziyu Chen Cong Chen Bin-Bin Liu Xian-Lei Sheng Shengyuan A.Yang School of Physics Beihang UniversityBeijing 100191China Department of Physics The University of Hong KongHong KongChina Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore Center for Quantum Transport and Thermal Energy Science School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China

Dirac semimetals(DSMs)are an important class of topological states of ***,focusing on DSMs of band inversion type,we investigate their boundary modes from the effective model *** show that in order to properly capture the boundary modes,k-cubic terms must be included in the effective model,which would drive an evolution of surface degeneracy manifold from a nodal line to a nodal *** k-cubic terms are also needed for better exposing the topological hinge modes in the *** first-principles calculations,we demonstrate that this feature and the topological hinge modes can be clearly exhibited inβ-*** extend the discussion to magnetic DSMs and show that the time-reversal symmetry breaking can gap out the surface bands and hence is beneficial for the experimental detection of hinge ***,we show that magnetic DSMs serve as a parent state for realizing multiple other higher-order topological phases,including higher-order Weyl-point/nodal-line semimetals and higher-order topological insulators.

关键词： topological hinge Dirac semimetals

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological Approach to the Study of Global Stationary Property of Quantum Systems

引用

Chinese Physics Letters 1999年第2期16卷 82-84页

作者： XU Gong-ou XING Yong-zhong YANG Ya-tian Department of Physics Nanjing UniversityNanjing 210093 Department of Physics fujian Normal Universityfuzhou 350007

A topological approach to the study of global stationary property of quantum systems is carefully *** attentions are paid to basic notions such as homeomorphic map,topological-structure-preserving(TSP)map,and bifurcat... 详细信息

关键词： topological Stationary bifurcation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

topological Wannier Cycles for the Bulk and Edges

引用

Chinese Physics Letters 2022年第8期39卷 39-46页

作者： Ze-Lin Kong Zhi-Kang Lin Jian-Hua Jiang School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215006China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Ministry of EducationSoochow UniversitySuzhou 215006China

topological materials are often characterized by unique edge states which are in turn used to detect different topological phases in ***,with the discovery of various higher-order topological insulators,such spectral topological characteristics are extended from edge states to corner ***,the chiral symmetry protecting the corner states is often broken in genuine materials,leading to vulnerable corner states even when the higher-order topological numbers remain quantized and ***,we show that a local artificial gauge flux can serve as a robust probe of the Wannier type higher-order topological insulators,which is effective even when the chiral symmetry is *** resultant observable signature is the emergence of the cyclic spectral flows traversing one or multiple band *** spectral flows are associated with the local modes bound to the artificial gauge *** phenomenon is essentially due to the cyclic transformation of the Wannier orbitals when the local gauge flux acts on *** extend topological Wannier cycles to systems with C_(2)and C_(3)symmetries and show that they can probe both the bulk and the edge Wannier centers,yielding rich topological phenomena.

关键词： topological gauge Wannier

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological holographic quench dynamics in a synthetic frequency dimension

引用

Light(Science & Applications) 2021年第11期10卷 2184-2194页

作者： Danying Yu Bo Peng Xianfeng Chen Xiong-Jun Liu Luqi Yuan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong University200240ShanghaiChina Shanghai Research Center for Quantum Sciences 201315ShanghaiChina Jinan Institute of Quantum Technology 250101JinanChina Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University250358JinanChina International Center for Quantum Materials and School of Physics Peking University100871BeijingChina Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology518055ShenzhenChina

The notion of topological phases extended to dynamical systems stimulates extensive studies,of which the characterization of nonequilibrium topological invariants is a central issue and usually necessitates the information of quantum dynamics in both the time and momentum ***,we propose the topological holographic quench dynamics in synthetic dimension,and also show it provides a highly efficient scheme to characterize photonic topological phases.A pseudospin model is constructed with ring resonators in a synthetic lattice formed by frequencies of light,and the quench dynamics is induced by initializing a trivial state,which evolves under a topological *** key prediction is that the complete topological information of the Hamiltonian is encoded in quench dynamics solely in the time dimension,and is further mapped to lower-dimensional space,manifesting the holographic features of the *** particular,two fundamental time scales emerge in the dynamical evolution,with one mimicking the topological band on the momentum dimension and the other characterizing the residue time evolution of the state after the *** this,a universal duality between the quench dynamics and the equilibrium topological phase of the spin model is obtained in the time dimension by extracting information from the field evolution dynamics in modulated ring systems in *** work also shows that the photonic synthetic frequency dimension provides an efficient and powerful way to explore the topological nonequilibrium dynamics.

关键词： dynamics dimension topological

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

topological non-reciprocal robust waveguide transport

引用

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 39-45页

作者： Ruizhi Dong Yihuan Zhu Dongxing Mao Xu Wang Yong Li Institute of Acoustics Tongji UniversityShanghai 200092China

Devices that surpass the restriction of reciprocity of classical physical waves have brought intriguing possibilities for wave ***-reciprocal acoustic devices that rely on the viscosity of the medium or nonlinear effect have low efficiency and distortion problems respectively,and poor immunity to *** appearance of acoustic topological insulators achieves nonreciprocal transport with high ***,the local nature of topological states means that their appearance depends on a system with a larger *** is,most of the area of a topological device is occupied by useless lattices that do not directly contribute to non-reciprocal *** extra cost of topology protection severely limits the application scenarios of topology states,decreases the cost-effectiveness of topology devices,and is not conducive to device miniaturization and *** this work,we construct an acoustic three-layer heterojunction by introducing two types of domain walls into a conventional quantum Hall effect acoustic topological insulator,and successfully construct a non-reciprocal scattering network that forms topological modes spanning the interlayer *** extended states are still protected by bulk-band topology,making their non-reciprocity robust against *** structure flawlessly realizes the path broadening in a two-dimensional topological system and can accomplish functions such as non-reciprocal acoustic splitting and multichannel *** work opens up opportunities for developing topological-insulator-based non-reciprocal devices in acoustics.

关键词： reciprocal topological topology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological Knots in Quantum Spin Systems

引用

Chinese Physics Letters 2021年第6期38卷 7-12页

作者： X.M.Yang L.Jin Z.Song School of Physics Nankai UniversityTianjin 300071China

Knot theory provides a powerful tool for understanding topological matters in biology,chemistry,and *** knot theory is introduced to describe topological phases in a quantum spin *** solvable models with long-range interactions are investigated,and Majorana modes of the quantum spin system are mapped into different knots and *** topological properties of ground states of the spin system are visualized and characterized using crossing and linking numbers,which capture the geometric topologies of knots and *** interactivity of energy bands is *** gapped phases,eigenstate curves are tangled and braided around each other,forming *** gapless phases,the tangled eigenstate curves may form *** findings provide an alternative understanding of phases in the quantum spin system,and provide insights into one-dimension topological phases of matter.

关键词： topological quantum system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

topological dynamical decoupling

引用

Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 2-9页

作者： Jiang Zhang Xiao-Dong Yu Gui-Lu Long Qi-Kun Xue State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Naturwissenschaftlich-Technische Fakultcit Universitat SiegenWaiter-Flex-Strafie 357068 SiegenGermany Beijing National Research Center for Information Science and Technology Beijing 100084China Collaborative Innovation Center of Quantum Matter Beijing 100084China

We show that topological equivalence classes of circles in a two-dimensional square lattice can be used to design dynamical decoupling procedures to protect qubits attached on the edges of the lattice. Based on the circles of the topologically trivial class in the original and the dual lattices, we devise a procedure which removes all kinds of local Hamiltonians from the dynamics of the qubits while keeping information stored in the homological degrees of freedom unchanged. If only the linearly independent interaction and nearest-neighbor two-qubit interactions are concerned, a much simpler procedure which involves the four equivalence classes of circles can be designed. This procedure is compatible with Eulerian and concatenated dynamical decouplings,which make it possible to implement the procedure with bounded-strength controls and for a long time period. As an application,it is shown that our method can be directly generalized to finite square lattices to suppress uncorrectable errors in surface codes.

关键词： dynamical decoupling surface codes topological quantum computation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：