光学晶格上单轴调制狄拉克点的合并

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER
A. López, B. Montañes, Ernesto Antonio Medina Dagger
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引用次数: 0

摘要

我们分析了用电场模拟单轴应变来调制光学蜂窝晶格中束缚原子的电位强度的方案。这种调制可以通过结合图案化电场的强度和使用Floquet方法的规范矢量效应来实现。我们表明,当两个非等效K点作为电场强度的函数合并时,这种调制允许人们在半金属和带绝缘体之间进行拓扑跃迁。我们明确地计算了移动K点的波函数和一直到过渡的陈氏数。各向异性有效质量和绝缘间隙被描述为接近半金属-绝缘体转变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Merging of Dirac points through uniaxial modulation on an optical lattice
We analyze the scenario of modulating the potential strength of bound atoms in an optical honeycomb lattice patterned by an electric field to emulate uniaxial strain. This modulation can be achieved by a combination of the strength of the patterned electric field and gauge vector effects using the Floquet approach. We show that such a modulation allows one to follow through a topological transition between a semi-metal and a band insulator, when two non-equivalent K points merge as a function of the electric field strength. We explicitly compute the wavefunctions for the moving K points and the Chern numbers up to the transition. Anisotropic effective masses and the insulating gap are described close to the semimetal-insulator transition.
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来源期刊
Condensed Matter Physics
Condensed Matter Physics 物理-物理:凝聚态物理
CiteScore
1.10
自引率
16.70%
发文量
17
审稿时长
1 months
期刊介绍: Condensed Matter Physics contains original and review articles in the field of statistical mechanics and thermodynamics of equilibrium and nonequilibrium processes, relativistic mechanics of interacting particle systems.The main attention is paid to physics of solid, liquid and amorphous systems, phase equilibria and phase transitions, thermal, structural, electric, magnetic and optical properties of condensed matter. Condensed Matter Physics is published quarterly.
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