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arXiv 2104.02852cond-mat.mes-hallcond-mat.dis-nn
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拓扑向错泵

Topological Disclination Pump

Bi-Ye Xie, Oubo You, Shuang Zhang

摘要:

当系统参数在循环过程中变化时,拓扑泵能够实现量子化粒子的鲁棒传输。在以往的研究中,拓扑泵浦是通过引入时间作为一个附加的合成维度,并利用体能带结构的拓扑不变量来保证的非均匀系统来实现的。最近,体边界对应已被推广到体向错对应,描述了出现的拓扑有界状态的晶体缺陷保护的体拓扑结构。在这里,我们表明,拓扑泵浦可以发生在不同的向错态与不同的手征在一个非均匀结构。基于对电荷泵过程的一般理解,我们通过追踪每个晶胞中Wannier中心的运动来解释拓扑向错泵。此外,通过构造两个向错结构和引入破缺微扰,实现了不同位错核之间的拓扑泵浦。我们的结果开辟了一条研究非均匀拓扑晶体系统中的拓扑泵浦的途径,并提供了一个灵活的平台,强大的能量传输。

英文摘要:

A topological pump enables robust transport of quantized particles when the system parameters are varied in a cyclic process. In previous studies, topological pump was achieved inhomogeneous systems guaranteed by a topological invariant of the bulk band structure when time is included as an additional synthetic dimension. Recently, bulk-boundary correspondence has been generalized to the bulk-disclination correspondence, describing the emergence of topological bounded states in the crystallographic defects protected by the bulk topology. Here we show the topological pumping can happen between different disclination states with different chiralities in an inhomogeneous structure. Based on a generalized understanding of the charge pumping process, we explain the topological disclination pump by tracing the motion of Wannier centers in each unit cell. Besides, by constructing two disclination structures and introducing a symmetry-breaking perturbation, we achieve a topological pumping between different dislocation cores. Our result opens a route to study the topological pumping in inhomogeneous topological crystalline systems and provides a flexible platform for robust energy transport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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