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arXiv 2009.05917cond-mat.supr-concond-mat.str-el
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准一维超导体TaSe $_3$中的弱拓扑绝缘体态

A weak topological insulator state in quasi-one-dimensional superconductor TaSe$_3$

Jounghoon Hyun, Min Yong Jeong, Sunghun Kim, Myung-Chul Jung, Yeonghoon Lee, Chan-young Lim, Jaehun Cha, Gyubin Lee, Yeojin An, Makoto Hashimoto, Donghui Lu, Jo… 展开作者

Jounghoon Hyun, Min Yong Jeong, Sunghun Kim, Myung-Chul Jung, Yeonghoon Lee, Chan-young Lim, Jaehun Cha, Gyubin Lee, Yeojin An, Makoto Hashimoto, Donghui Lu, Jonathan D. Denlinger, Myung Joon Han, Yeongkwan Kim

摘要:

在固态系统中发现新的马约拉纳粒子的一个公认的方法是具有由拓扑电子结构产生的超导性。为此,在过去的十年中,由正常超导体和拓扑材料组成的异质结构系统被积极地探索。然而,对同时表现出本征超导性和拓扑相的单一材料系统的研究在很大程度上受到限制,尽管这样的系统特别是对于量子器件应用来说更有利。本文报道准一维(q1D)超导体TaSe $_3$的电子结构研究。角分辨光电子能谱(ARPES)和第一性原理计算的结果清楚地表明TaSe $_3$是一种拓扑超导体。特征体反转间隙,在间隙状态和非狄拉克色散的形状同时指向这种材料的拓扑非平凡的性质。进一步研究了Z $_2$指数和拓扑上独特的表面能带交叉,表明它属于弱拓扑绝缘体(WTI)类。因此,TaSe $_3$成为本征一维拓扑超导体的第一个验证的例子。它有望提供一个有前途的平台,为未来的应用,利用马约拉纳束缚态本地化的1D本征拓扑超导体的结束。

英文摘要:

A well-established way to find novel Majorana particles in a solid-state system is to have superconductivity arising from the topological electronic structure. To this end, the heterostructure systems that consist of normal superconductor and topological material have been actively explored in the past decade. However, a search for the single material system that simultaneously exhibits intrinsic superconductivity and topological phase has been largely limited, although such a system is far more favorable especially for the quantum device applications. Here, we report the electronic structure study of a quasi-one-dimensional (q1D) superconductor TaSe$_3$. Our results of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculation clearly show that TaSe$_3$ is a topological superconductor. The characteristic bulk inversion gap, in-gap state and its shape of non-Dirac dispersion concurrently point to the topologically nontrivial nature of this material. The further investigations of the Z$_2$ indices and the topologically distinctive surface band crossings disclose that it belongs to the weak topological insulator (WTI) class. Hereby, TaSe$_3$ becomes the first verified example of an intrinsic 1D topological superconductor. It hopefully provides a promising platform for future applications utilizing Majorana bound states localized at the end of 1D intrinsic topological superconductors.

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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