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Role of helical edge modes in the chiral quantum anomalous Hall state
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 m...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5778147/ https://www.ncbi.nlm.nih.gov/pubmed/29358646 http://dx.doi.org/10.1038/s41598-018-19272-7 |
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author | Mani, Arjun Benjamin, Colin |
author_facet | Mani, Arjun Benjamin, Colin |
author_sort | Mani, Arjun |
collection | PubMed |
description | 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 | Online Article Text |
id | pubmed-5778147 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-57781472018-01-31 Role of helical edge modes in the chiral quantum anomalous Hall state Mani, Arjun Benjamin, Colin Sci Rep Article 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. Nature Publishing Group UK 2018-01-22 /pmc/articles/PMC5778147/ /pubmed/29358646 http://dx.doi.org/10.1038/s41598-018-19272-7 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Mani, Arjun Benjamin, Colin Role of helical edge modes in the chiral quantum anomalous Hall state |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5778147/ https://www.ncbi.nlm.nih.gov/pubmed/29358646 http://dx.doi.org/10.1038/s41598-018-19272-7 |
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