Topologically distinct Weyl fermion pairs

Abstract A Weyl semimetal has Weyl nodes that always come in pairs with opposite chiralities. Notably, different ways of connection between nodes are possible and would lead to distinct topologies. Here we identify their differences in many respects from two proposed models with different vorticitie...

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Autores principales:	Ming-Chien Hsu, Hsin Lin, M. Zahid Hasan, Shin-Ming Huang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/777f735d0c304a65b0db111528e83a7b
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spelling	oai:doaj.org-article:777f735d0c304a65b0db111528e83a7b2021-12-02T14:12:09ZTopologically distinct Weyl fermion pairs10.1038/s41598-020-79977-62045-2322https://doaj.org/article/777f735d0c304a65b0db111528e83a7b2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79977-6https://doaj.org/toc/2045-2322Abstract A Weyl semimetal has Weyl nodes that always come in pairs with opposite chiralities. Notably, different ways of connection between nodes are possible and would lead to distinct topologies. Here we identify their differences in many respects from two proposed models with different vorticities. One prominent feature is the behaviour of zeroth Landau levels (LLs) under magnetic field. We demonstrate that the magnetic tunneling does not always expel LLs from zero energy because the number of zero-energy modes is protected by the vorticity of the Weyl nodes, instead of the chirality. Other respects in disorder effects for weak (anti-)localization, surface Fermi arcs, and Weyl-node annihilation, are interesting consequences that await more investigation in the future.Ming-Chien HsuHsin LinM. Zahid HasanShin-Ming HuangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ming-Chien Hsu Hsin Lin M. Zahid Hasan Shin-Ming Huang Topologically distinct Weyl fermion pairs
description	Abstract A Weyl semimetal has Weyl nodes that always come in pairs with opposite chiralities. Notably, different ways of connection between nodes are possible and would lead to distinct topologies. Here we identify their differences in many respects from two proposed models with different vorticities. One prominent feature is the behaviour of zeroth Landau levels (LLs) under magnetic field. We demonstrate that the magnetic tunneling does not always expel LLs from zero energy because the number of zero-energy modes is protected by the vorticity of the Weyl nodes, instead of the chirality. Other respects in disorder effects for weak (anti-)localization, surface Fermi arcs, and Weyl-node annihilation, are interesting consequences that await more investigation in the future.
format	article
author	Ming-Chien Hsu Hsin Lin M. Zahid Hasan Shin-Ming Huang
author_facet	Ming-Chien Hsu Hsin Lin M. Zahid Hasan Shin-Ming Huang
author_sort	Ming-Chien Hsu
title	Topologically distinct Weyl fermion pairs
title_short	Topologically distinct Weyl fermion pairs
title_full	Topologically distinct Weyl fermion pairs
title_fullStr	Topologically distinct Weyl fermion pairs
title_full_unstemmed	Topologically distinct Weyl fermion pairs
title_sort	topologically distinct weyl fermion pairs
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/777f735d0c304a65b0db111528e83a7b
work_keys_str_mv	AT mingchienhsu topologicallydistinctweylfermionpairs AT hsinlin topologicallydistinctweylfermionpairs AT mzahidhasan topologicallydistinctweylfermionpairs AT shinminghuang topologicallydistinctweylfermionpairs
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Topologically distinct Weyl fermion pairs

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