Role of helical edge modes in the chiral quantum anomalous Hall state

Abstract Although indications are that a single chiral quantum anomalous Hall(QAH) edge mode might have been experimentally detected. There have been very many recent experiments which conjecture that a chiral QAH edge mode always materializes along with a pair of quasi-helical quantum spin Hall (QS...

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Autores principales:	Arjun Mani, Colin Benjamin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/04220616199646afbc2ff3c7f7dc07bc
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spelling	oai:doaj.org-article:04220616199646afbc2ff3c7f7dc07bc2021-12-02T15:08:50ZRole of helical edge modes in the chiral quantum anomalous Hall state10.1038/s41598-018-19272-72045-2322https://doaj.org/article/04220616199646afbc2ff3c7f7dc07bc2018-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-19272-7https://doaj.org/toc/2045-2322Abstract Although indications are that a single chiral quantum anomalous Hall(QAH) edge mode might have been experimentally detected. There have been very many recent experiments which conjecture that a chiral QAH edge mode always materializes along with a pair of quasi-helical quantum spin Hall (QSH) edge modes. In this work we deal with a substantial ‘What If?’ question- in case the QSH edge modes, from which these QAH edge modes evolve, are not topologically-protected then the QAH edge modes wont be topologically-protected too and thus unfit for use in any applications. Further, as a corollary one can also ask if the topological-protection of QSH edge modes does not carry over during the evolution process to QAH edge modes then again our ‘What if?’ scenario becomes apparent. The ‘how’ of the resolution of this ‘What if?’ conundrum is the main objective of our work. We show in similar set-ups affected by disorder and inelastic scattering, transport via trivial QAH edge mode leads to quantization of Hall resistance and not that via topological QAH edge modes. This perhaps begs a substantial reinterpretation of those experiments which purported to find signatures of chiral(topological) QAH edge modes albeit in conjunction with quasi helical QSH edge modes.Arjun ManiColin BenjaminNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-13 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Arjun Mani Colin Benjamin Role of helical edge modes in the chiral quantum anomalous Hall state
description	Abstract Although indications are that a single chiral quantum anomalous Hall(QAH) edge mode might have been experimentally detected. There have been very many recent experiments which conjecture that a chiral QAH edge mode always materializes along with a pair of quasi-helical quantum spin Hall (QSH) edge modes. In this work we deal with a substantial ‘What If?’ question- in case the QSH edge modes, from which these QAH edge modes evolve, are not topologically-protected then the QAH edge modes wont be topologically-protected too and thus unfit for use in any applications. Further, as a corollary one can also ask if the topological-protection of QSH edge modes does not carry over during the evolution process to QAH edge modes then again our ‘What if?’ scenario becomes apparent. The ‘how’ of the resolution of this ‘What if?’ conundrum is the main objective of our work. We show in similar set-ups affected by disorder and inelastic scattering, transport via trivial QAH edge mode leads to quantization of Hall resistance and not that via topological QAH edge modes. This perhaps begs a substantial reinterpretation of those experiments which purported to find signatures of chiral(topological) QAH edge modes albeit in conjunction with quasi helical QSH edge modes.
format	article
author	Arjun Mani Colin Benjamin
author_facet	Arjun Mani Colin Benjamin
author_sort	Arjun Mani
title	Role of helical edge modes in the chiral quantum anomalous Hall state
title_short	Role of helical edge modes in the chiral quantum anomalous Hall state
title_full	Role of helical edge modes in the chiral quantum anomalous Hall state
title_fullStr	Role of helical edge modes in the chiral quantum anomalous Hall state
title_full_unstemmed	Role of helical edge modes in the chiral quantum anomalous Hall state
title_sort	role of helical edge modes in the chiral quantum anomalous hall state
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/04220616199646afbc2ff3c7f7dc07bc
work_keys_str_mv	AT arjunmani roleofhelicaledgemodesinthechiralquantumanomaloushallstate AT colinbenjamin roleofhelicaledgemodesinthechiralquantumanomaloushallstate
_version_	1718387980000821248

Role of helical edge modes in the chiral quantum anomalous Hall state

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