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Chinese Physics B 2017年第10期26卷 169-174页

作者：黄露婷陈铮王永欣卢艳丽 State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University

Zigzag graphene nanoribbon （ZGNR） is a promising candidate for next-generation spintronic devices. Development of the field requires potential systems with variable and adjustable electromagnetic properties. Here we show a detailed investigation of ZGNR decorated with edge topological defects （ED-ZGNR） synthesized in laboratory by Ruffieux in 2015 [Pascal Ruffieux, Shiyong Wang, Bo Yang, et al. 2015 Nature 531 489]. The pristine ED-ZGNR in the ground state is an antiferromagnetic semiconductor, and the acquired band structure is significantly changed compared with that of perfect ZGNR. After doping heteroatoms on the edge, the breaking of degeneration of band structure makes the doped ribbon a half-semi-metal, and nonzero magnetic moments are induced. Our results indicate the tunable electronic and magnetic properties of ZGNR by deriving unique edge state from topological defect, which opens a new route to practical nano devices based on ZGNR.

关键词： graphene nanoribbons topological defect spin edge

Quench dynamics in 1D model with 3rd-nearest-neighbor hoppings

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Chinese Physics B 2021年第2期30卷 86-94页

作者：岳帅周祥发周正威 Key Laboratory of Quantum Information Chinese Academy of SciencesHefei 230026China Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China

The non-equilibrium dynamics of a one-dimensional(1 D)topological system with 3 rd-nearest-neighbor hopping has been investigated by analytical and numerical *** analytical form of topological defect density under the periodic boundary conditions(PBC)is obtained by using the Landau-Zener formula(LZF),which is consistent with the scaling of defect production provided by the Kibble-Zurek mechanism(KZM).Under the open boundary conditions(OBC),quench dynamics becomes more complicated due to edge *** behaviors of the system quenching across different phases show that defect production no longer satisfies the KZM paradigm since complicated couplings exist under *** new dynamical features are revealed.

关键词： Kibble-Zurek mechanism Landau-Zener transition topological defect topological insulator

topological effects on non-relativistic eigenvalue solutions under AB-flux field with pseudoharmonic- and Mie-type potentials

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Communications in Theoretical Physics 2023年第5期75卷 84-96页

作者： Faizuddin Ahmed Department of Physics University of Science&Technology MeghalayaRi-BhoiMeghalaya-793101India

In this paper,we investigate the quantum dynamics of a non-relativistic particle confined by the Aharonov-Bohm quantum flux field with pseudoharmonic-type potential in the background of topological defect produced by a point-like global *** solve the radial Schrödinger equation analytically and determine the exact eigenvalue solution of the quantum ***,we consider a Mie-type potential in the quantum system and solve the radial equation analytically and obtain the eigenvalue *** analyze the effects of the topological defect and the quantum flux with these potentials on the energy eigenvalue and wave function of the nonrelativistic *** fact,it is shown that the energy levels and wave functions are influenced by the topological defect shifted the result compared to the flat space *** addition,the quantum flux field also shifted the eigenvalue solutions and an analogue of the Aharonov-Bohm effect for bound-states is ***,we utilize these eigenvalue solutions to some known diatomic molecular potential models and presented the energy eigenvalue and wave function.

关键词： topological defect non-relativistic wave equation physical potential geometric quantum phase special function solutions of wave equation:bound-state

Analytic solutions in the acoustic black hole analogue of the conical Kerr metric

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Chinese Physics C 2017年第4期41卷 33-37页

作者： H. S. Vieira Departamento de Ffsica Universidade Federal da Paraiba Caixa Postal 5008 CEP 58051-970 Joao Pessoa PB Brazil Centro de Ciencias Tecnologia e Saude Universidade Estadual da Parafba CEP 58233-000 Araruna PB Brazil

We study the sound perturbation of a rotating acoustic black hole in the presence of a disclination. The radial part of the massless Klein-Gordon equation is written into a Heun form, and its analytical solution is obtained. These solutions have an explicit dependence on the parameter of the disclination. We obtain the exact Hawking-Unruh radiation spectrum.

关键词： draining bathtub fluid flow disclination topological defect massless Klein-Gordon equation confluent Heun function black hole radiation

Entropy-driven self-assembly of tethered Janus nanoparticles on a sphere

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Fundamental Research 2021年第5期1卷 641-648页

作者： Guolong Zhu Yuming Wang Lijuan Gao Ziyang Xu Xuanyu Zhang Xiaobin Dai Lijun Dai Cuiling Hou Li-Tang Yan State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084P.R.China

Understanding the effect of curvature and topological frustration on self-assembly yields insight into the mechanistic details of the ordering of identical subunits in curved spaces,such as the assembly of viral capsids,growth of solid domains on vesicles,and the self-assembly of molecular ***,the self-assembly of nanoparticles with anisotropic surface topology and compartmentalization on curved surfaces remains *** combining large-scale molecular simulations as well as theoretical analysis,we demonstrate here that the interplay among anisotropy,curvature,and chain conformation induces tethered Janus nanoparticles to self-assemble into diverse novel structures on a sphere,including binary nanocluster(C_(B)),trinary nanocluster(C_(T)),nanoribbon(R_(N))and hexagon with centered reverse(HR),which are mapped on a phase diagram related to the length asymmetry of tethered chains and Janus balance of the *** dynamical mechanism for the formation of these structure states is analyzed by examining the detailed kinetic pathways as well as free *** also show that the centered-reverse state is more prone to emerging around the topological defects,indicating the defect-enhanced entropy effect on a curved ***,the analytical model that rationalizes the regimes of these structure states is developed and fits simulations reasonably well,resulting in a mechanistic interpretation based on the order through *** findings shed light on curvature engineering as a versatile strategy to tailor the superstructures formed by anisotropic building blocks toward unique properties.

关键词： Curved surface Entropy-driven self-assembly defect-enhanced entropy effect topological defect Anisotropic particle