Nexus fermions in topological symmorphic crystalline metals

Abstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has bee...

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Autores principales:	Guoqing Chang, Su-Yang Xu, Shin-Ming Huang, Daniel S. Sanchez, Chuang-Han Hsu, Guang Bian, Zhi-Ming Yu, Ilya Belopolski, Nasser Alidoust, Hao Zheng, Tay-Rong Chang, Horng-Tay Jeng, Shengyuan A. Yang, Titus Neupert, Hsin Lin, M. Zahid Hasan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2d0ff473169f4c17a0b6a7df1fb862b5
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spelling	oai:doaj.org-article:2d0ff473169f4c17a0b6a7df1fb862b52021-12-02T16:06:59ZNexus fermions in topological symmorphic crystalline metals10.1038/s41598-017-01523-82045-2322https://doaj.org/article/2d0ff473169f4c17a0b6a7df1fb862b52017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01523-8https://doaj.org/toc/2045-2322Abstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has been well-established that the known TMs can be classified by the dimensionality of the topologically protected band degeneracies. While Weyl and Dirac semimetals feature zero-dimensional points, the band crossing of nodal-line semimetals forms a one-dimensional closed loop. In this paper, we identify a TM that goes beyond the above paradigms. It shows an exotic configuration of degeneracies without a well-defined dimensionality. Specifically, it consists of 0D nexus with triple-degeneracy that interconnects 1D lines with double-degeneracy. We show that, because of the novel form of band crossing, the new TM cannot be described by the established results that characterize the topology of the Dirac and Weyl nodes. Moreover, triply-degenerate nodes realize emergent fermionic quasiparticles not present in relativistic quantum field theory. We present materials candidates. Our results open the door for realizing new topological phenomena and fermions including transport anomalies and spectroscopic responses in metallic crystals with nontrivial topology beyond the Weyl/Dirac paradigm.Guoqing ChangSu-Yang XuShin-Ming HuangDaniel S. SanchezChuang-Han HsuGuang BianZhi-Ming YuIlya BelopolskiNasser AlidoustHao ZhengTay-Rong ChangHorng-Tay JengShengyuan A. YangTitus NeupertHsin LinM. Zahid HasanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan Nexus fermions in topological symmorphic crystalline metals
description	Abstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has been well-established that the known TMs can be classified by the dimensionality of the topologically protected band degeneracies. While Weyl and Dirac semimetals feature zero-dimensional points, the band crossing of nodal-line semimetals forms a one-dimensional closed loop. In this paper, we identify a TM that goes beyond the above paradigms. It shows an exotic configuration of degeneracies without a well-defined dimensionality. Specifically, it consists of 0D nexus with triple-degeneracy that interconnects 1D lines with double-degeneracy. We show that, because of the novel form of band crossing, the new TM cannot be described by the established results that characterize the topology of the Dirac and Weyl nodes. Moreover, triply-degenerate nodes realize emergent fermionic quasiparticles not present in relativistic quantum field theory. We present materials candidates. Our results open the door for realizing new topological phenomena and fermions including transport anomalies and spectroscopic responses in metallic crystals with nontrivial topology beyond the Weyl/Dirac paradigm.
format	article
author	Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan
author_facet	Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan
author_sort	Guoqing Chang
title	Nexus fermions in topological symmorphic crystalline metals
title_short	Nexus fermions in topological symmorphic crystalline metals
title_full	Nexus fermions in topological symmorphic crystalline metals
title_fullStr	Nexus fermions in topological symmorphic crystalline metals
title_full_unstemmed	Nexus fermions in topological symmorphic crystalline metals
title_sort	nexus fermions in topological symmorphic crystalline metals
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/2d0ff473169f4c17a0b6a7df1fb862b5
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Nexus fermions in topological symmorphic crystalline metals

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