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Observation of boundary induced chiral anomaly bulk states and their transport properties

The most useful property of topological materials is perhaps the robust transport of topological edge modes, whose existence depends on bulk topological invariants. This means that we need to make volumetric changes to many atoms in the bulk to control the transport properties of the edges in a samp...

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Autores principales: Wang, Mudi, Ma, Qiyun, Liu, Shan, Zhang, Ruo-Yang, Zhang, Lei, Ke, Manzhu, Liu, Zhengyou, Chan, C. T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9546894/
https://www.ncbi.nlm.nih.gov/pubmed/36207327
http://dx.doi.org/10.1038/s41467-022-33447-x
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author Wang, Mudi
Ma, Qiyun
Liu, Shan
Zhang, Ruo-Yang
Zhang, Lei
Ke, Manzhu
Liu, Zhengyou
Chan, C. T.
author_facet Wang, Mudi
Ma, Qiyun
Liu, Shan
Zhang, Ruo-Yang
Zhang, Lei
Ke, Manzhu
Liu, Zhengyou
Chan, C. T.
author_sort Wang, Mudi
collection PubMed
description The most useful property of topological materials is perhaps the robust transport of topological edge modes, whose existence depends on bulk topological invariants. This means that we need to make volumetric changes to many atoms in the bulk to control the transport properties of the edges in a sample. We suggest here that we can do the reverse in some cases: the properties of the edge can be used to induce chiral transport phenomena in some bulk modes. Specifically, we show that a topologically trivial 2D hexagonal phononic crystal slab (waveguide) bounded by hard-wall boundaries guarantees the existence of bulk modes with chiral anomaly inside a pseudogap due to finite size effect. We experimentally observed robust valley-selected transport, complete valley state conversion, and valley focusing of the chiral anomaly bulk states (CABSs) in such phononic crystal waveguides. The same concept also applies to electromagnetics.
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spelling pubmed-95468942022-10-09 Observation of boundary induced chiral anomaly bulk states and their transport properties Wang, Mudi Ma, Qiyun Liu, Shan Zhang, Ruo-Yang Zhang, Lei Ke, Manzhu Liu, Zhengyou Chan, C. T. Nat Commun Article The most useful property of topological materials is perhaps the robust transport of topological edge modes, whose existence depends on bulk topological invariants. This means that we need to make volumetric changes to many atoms in the bulk to control the transport properties of the edges in a sample. We suggest here that we can do the reverse in some cases: the properties of the edge can be used to induce chiral transport phenomena in some bulk modes. Specifically, we show that a topologically trivial 2D hexagonal phononic crystal slab (waveguide) bounded by hard-wall boundaries guarantees the existence of bulk modes with chiral anomaly inside a pseudogap due to finite size effect. We experimentally observed robust valley-selected transport, complete valley state conversion, and valley focusing of the chiral anomaly bulk states (CABSs) in such phononic crystal waveguides. The same concept also applies to electromagnetics. Nature Publishing Group UK 2022-10-07 /pmc/articles/PMC9546894/ /pubmed/36207327 http://dx.doi.org/10.1038/s41467-022-33447-x Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Wang, Mudi
Ma, Qiyun
Liu, Shan
Zhang, Ruo-Yang
Zhang, Lei
Ke, Manzhu
Liu, Zhengyou
Chan, C. T.
Observation of boundary induced chiral anomaly bulk states and their transport properties
title Observation of boundary induced chiral anomaly bulk states and their transport properties
title_full Observation of boundary induced chiral anomaly bulk states and their transport properties
title_fullStr Observation of boundary induced chiral anomaly bulk states and their transport properties
title_full_unstemmed Observation of boundary induced chiral anomaly bulk states and their transport properties
title_short Observation of boundary induced chiral anomaly bulk states and their transport properties
title_sort observation of boundary induced chiral anomaly bulk states and their transport properties
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9546894/
https://www.ncbi.nlm.nih.gov/pubmed/36207327
http://dx.doi.org/10.1038/s41467-022-33447-x
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