$Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}$
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Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}

Quasi-one-dimensional (1D) materials provide a superior platform for characterizing and tuning topological phases for two reasons: (i) existence for multiple cleavable surfaces that enables better experimental identification of topological classification and (ii) stronger response to perturbations s...

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Autores principales:	Jianwei Huang, Sheng Li, Chiho Yoon, Ji Seop Oh, Han Wu, Xiaoyuan Liu, Nikhil Dhale, Yan-Feng Zhou, Yucheng Guo, Yichen Zhang, Makoto Hashimoto, Donghui Lu, Jonathan Denlinger, Xiqu Wang, Chun Ning Lau, Robert J. Birgeneau, Fan Zhang, Bing Lv, Ming Yi
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/315ca3c4771f465586b525196c1a4fbe
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spelling	oai:doaj.org-article:315ca3c4771f465586b525196c1a4fbe2021-12-02T17:09:48ZRoom-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}10.1103/PhysRevX.11.0310422160-3308https://doaj.org/article/315ca3c4771f465586b525196c1a4fbe2021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031042http://doi.org/10.1103/PhysRevX.11.031042https://doaj.org/toc/2160-3308Quasi-one-dimensional (1D) materials provide a superior platform for characterizing and tuning topological phases for two reasons: (i) existence for multiple cleavable surfaces that enables better experimental identification of topological classification and (ii) stronger response to perturbations such as strain for tuning topological phases compared to higher dimensional crystal structures. In this paper, we present experimental evidence for a room-temperature topological phase transition in the quasi-1D material Bi_{4}I_{4}, mediated via a first-order structural transition between two distinct stacking orders of the weakly coupled chains. Using high-resolution angle-resolved photoemission spectroscopy on the two natural cleavable surfaces, we identify the high-temperature β phase to be the first weak topological insulator with two gapless Dirac cones on the (100) surface and no Dirac crossing on the (001) surface, while in the low-temperature α phase, the topological surface state on the (100) surface opens a gap, consistent with a recent theoretical prediction of a higher-order topological insulator beyond the scope of the established topological materials databases that hosts gapless hinge states. Our results not only identify a rare topological phase transition between first-order and second-order topological insulators but also establish a novel quasi-1D material platform for exploring unprecedented physics.Jianwei HuangSheng LiChiho YoonJi Seop OhHan WuXiaoyuan LiuNikhil DhaleYan-Feng ZhouYucheng GuoYichen ZhangMakoto HashimotoDonghui LuJonathan DenlingerXiqu WangChun Ning LauRobert J. BirgeneauFan ZhangBing LvMing YiAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031042 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Jianwei Huang Sheng Li Chiho Yoon Ji Seop Oh Han Wu Xiaoyuan Liu Nikhil Dhale Yan-Feng Zhou Yucheng Guo Yichen Zhang Makoto Hashimoto Donghui Lu Jonathan Denlinger Xiqu Wang Chun Ning Lau Robert J. Birgeneau Fan Zhang Bing Lv Ming Yi Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
description	Quasi-one-dimensional (1D) materials provide a superior platform for characterizing and tuning topological phases for two reasons: (i) existence for multiple cleavable surfaces that enables better experimental identification of topological classification and (ii) stronger response to perturbations such as strain for tuning topological phases compared to higher dimensional crystal structures. In this paper, we present experimental evidence for a room-temperature topological phase transition in the quasi-1D material Bi_{4}I_{4}, mediated via a first-order structural transition between two distinct stacking orders of the weakly coupled chains. Using high-resolution angle-resolved photoemission spectroscopy on the two natural cleavable surfaces, we identify the high-temperature β phase to be the first weak topological insulator with two gapless Dirac cones on the (100) surface and no Dirac crossing on the (001) surface, while in the low-temperature α phase, the topological surface state on the (100) surface opens a gap, consistent with a recent theoretical prediction of a higher-order topological insulator beyond the scope of the established topological materials databases that hosts gapless hinge states. Our results not only identify a rare topological phase transition between first-order and second-order topological insulators but also establish a novel quasi-1D material platform for exploring unprecedented physics.
format	article
author	Jianwei Huang Sheng Li Chiho Yoon Ji Seop Oh Han Wu Xiaoyuan Liu Nikhil Dhale Yan-Feng Zhou Yucheng Guo Yichen Zhang Makoto Hashimoto Donghui Lu Jonathan Denlinger Xiqu Wang Chun Ning Lau Robert J. Birgeneau Fan Zhang Bing Lv Ming Yi
author_facet	Jianwei Huang Sheng Li Chiho Yoon Ji Seop Oh Han Wu Xiaoyuan Liu Nikhil Dhale Yan-Feng Zhou Yucheng Guo Yichen Zhang Makoto Hashimoto Donghui Lu Jonathan Denlinger Xiqu Wang Chun Ning Lau Robert J. Birgeneau Fan Zhang Bing Lv Ming Yi
author_sort	Jianwei Huang
title	Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
title_short	Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
title_full	Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
title_fullStr	Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
title_full_unstemmed	Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}
title_sort	room-temperature topological phase transition in quasi-one-dimensional material bi_{4}i_{4}
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/315ca3c4771f465586b525196c1a4fbe
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Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material Bi_{4}I_{4}

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