$Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}$
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Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}

The interplay between time-reversal symmetry (TRS) and band topology plays a crucial role in topological states of quantum matter. In time-reversal-invariant (TRI) systems, the inversion of spin-degenerate bands with opposite parity leads to nontrivial topological states, such as topological insulat...

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Autores principales:	Shun-Ye Gao, Sheng Xu, Hang Li, Chang-Jiang Yi, Si-Min Nie, Zhi-Cheng Rao, Huan Wang, Quan-Xin Hu, Xue-Zhi Chen, Wen-Hui Fan, Jie-Rui Huang, Yao-Bo Huang, Nini Pryds, Ming Shi, Zhi-Jun Wang, You-Guo Shi, Tian-Long Xia, Tian Qian, Hong Ding
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/539d102e3a794dbda4cf1ab137540a2a
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spelling	oai:doaj.org-article:539d102e3a794dbda4cf1ab137540a2a2021-12-02T15:52:00ZTime-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}10.1103/PhysRevX.11.0210162160-3308https://doaj.org/article/539d102e3a794dbda4cf1ab137540a2a2021-04-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021016http://doi.org/10.1103/PhysRevX.11.021016https://doaj.org/toc/2160-3308The interplay between time-reversal symmetry (TRS) and band topology plays a crucial role in topological states of quantum matter. In time-reversal-invariant (TRI) systems, the inversion of spin-degenerate bands with opposite parity leads to nontrivial topological states, such as topological insulators and Dirac semimetals. When the TRS is broken, the exchange field induces spin splitting of the bands. The inversion of a pair of spin-splitting subbands can generate more exotic topological states, such as quantum anomalous Hall insulators and magnetic Weyl semimetals. So far, such topological phase transitions driven by the TRS breaking have not been visualized. In this work, using angle-resolved photoemission spectroscopy, we have demonstrated that the TRS breaking induces a band inversion of a pair of spin-splitting subbands at the TRI points of Brillouin zone in EuB_{6}, when a long-range ferromagnetic order is developed. The dramatic changes in the electronic structure result in a topological phase transition from a TRI ordinary insulator state to a TRS-broken topological semimetal (TSM) state. Remarkably, the magnetic TSM state has an ideal electronic structure, in which the band crossings are located at the Fermi level without any interference from other bands. Our findings not only reveal the topological phase transition driven by the TRS breaking, but also provide an excellent platform to explore novel physical behavior in the magnetic topological states of quantum matter.Shun-Ye GaoSheng XuHang LiChang-Jiang YiSi-Min NieZhi-Cheng RaoHuan WangQuan-Xin HuXue-Zhi ChenWen-Hui FanJie-Rui HuangYao-Bo HuangNini PrydsMing ShiZhi-Jun WangYou-Guo ShiTian-Long XiaTian QianHong DingAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021016 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Shun-Ye Gao Sheng Xu Hang Li Chang-Jiang Yi Si-Min Nie Zhi-Cheng Rao Huan Wang Quan-Xin Hu Xue-Zhi Chen Wen-Hui Fan Jie-Rui Huang Yao-Bo Huang Nini Pryds Ming Shi Zhi-Jun Wang You-Guo Shi Tian-Long Xia Tian Qian Hong Ding Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
description	The interplay between time-reversal symmetry (TRS) and band topology plays a crucial role in topological states of quantum matter. In time-reversal-invariant (TRI) systems, the inversion of spin-degenerate bands with opposite parity leads to nontrivial topological states, such as topological insulators and Dirac semimetals. When the TRS is broken, the exchange field induces spin splitting of the bands. The inversion of a pair of spin-splitting subbands can generate more exotic topological states, such as quantum anomalous Hall insulators and magnetic Weyl semimetals. So far, such topological phase transitions driven by the TRS breaking have not been visualized. In this work, using angle-resolved photoemission spectroscopy, we have demonstrated that the TRS breaking induces a band inversion of a pair of spin-splitting subbands at the TRI points of Brillouin zone in EuB_{6}, when a long-range ferromagnetic order is developed. The dramatic changes in the electronic structure result in a topological phase transition from a TRI ordinary insulator state to a TRS-broken topological semimetal (TSM) state. Remarkably, the magnetic TSM state has an ideal electronic structure, in which the band crossings are located at the Fermi level without any interference from other bands. Our findings not only reveal the topological phase transition driven by the TRS breaking, but also provide an excellent platform to explore novel physical behavior in the magnetic topological states of quantum matter.
format	article
author	Shun-Ye Gao Sheng Xu Hang Li Chang-Jiang Yi Si-Min Nie Zhi-Cheng Rao Huan Wang Quan-Xin Hu Xue-Zhi Chen Wen-Hui Fan Jie-Rui Huang Yao-Bo Huang Nini Pryds Ming Shi Zhi-Jun Wang You-Guo Shi Tian-Long Xia Tian Qian Hong Ding
author_facet	Shun-Ye Gao Sheng Xu Hang Li Chang-Jiang Yi Si-Min Nie Zhi-Cheng Rao Huan Wang Quan-Xin Hu Xue-Zhi Chen Wen-Hui Fan Jie-Rui Huang Yao-Bo Huang Nini Pryds Ming Shi Zhi-Jun Wang You-Guo Shi Tian-Long Xia Tian Qian Hong Ding
author_sort	Shun-Ye Gao
title	Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
title_short	Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
title_full	Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
title_fullStr	Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
title_full_unstemmed	Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
title_sort	time-reversal symmetry breaking driven topological phase transition in eub_{6}
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/539d102e3a794dbda4cf1ab137540a2a
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Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}

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