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arXiv 2205.02583cond-mat.mes-hallcond-mat.mtrl-sci
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二维可剥离材料中量子自旋霍尔绝缘体的互补筛选

A complementary screening for quantum spin Hall insulators in 2D exfoliable materials

Davide Grassano, Davide Campi, Antimo Marrazzo, Nicola Marzari

AI总结:

本研究从783种二维可剥离材料出发,对量子自旋霍尔绝缘体进行高通量筛选,发现了一种新的 $\mathbb{Z}_2$ 拓扑绝缘体(HgNS)及7种潜在材料。

摘要:

量子自旋霍尔绝缘体是过去十年中被广泛研究的一类拓扑材料。其显著特征之一是体内存在有限带隙,以及具有自旋动量锁定且无带隙的拓扑保护边缘态。这些材料以 $\mathbb{Z}_2$ 拓扑序为特征,在二维情况下,单一拓扑不变量对于平庸材料或拓扑材料分别为偶数或奇数。得益于无耗散自旋电流、自旋泵浦和自旋滤波等有趣特性的实现,它们在电子学、自旋电子学和量子计算领域备受关注。在这项工作中,我们从最近通过对 ICSD、COD 和 MPDS 数据库进行系统筛选而确定的 783 种二维可剥离材料出发,对量子自旋霍尔绝缘体进行了高通量筛选。我们发现了一种新的 $\mathbb{Z}_2$ 拓扑绝缘体(HgNS),以及 3 种已知的拓扑绝缘体和 7 种在合理弱外部扰动下有潜力成为量子自旋霍尔绝缘体的直接带隙金属。

英文摘要:

Quantum spin Hall insulators are a class of topological materials that has been extensively studied during the past decade. One of their distinctive features is the presence of a finite band gap in the bulk and gapless, topologically protected edge states that are spin-momentum locked. These materials are characterized by a $\mathbb{Z}_2$ topological order where, in the 2D case, a single topological invariant can be even or odd for a trivial or a topological material, respectively. Thanks to their interesting properties, such as the realization of dissipationless spin currents, spin pumping and spin filtering, they are of great interest in the field of electronics, spintronics and quantum computing. In this work we perform an high-throughput screening of Quantum spin Hall insulators starting from a set of 783 2D exfoliable materials, recently identified from a systematic screening of the ICSD, COD, and MPDS databases. We find a new $\mathbb{Z}_2$ topological insulator (HgNS) as well as 3 already known ones and 7 direect gap metals that have the potential of becoming Quantum spin Hall insulators under a reasonably weak external perturbation.

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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