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Non-Abelian Bloch oscillations in higher-order topological insulators
Bloch oscillations (BOs) are a fundamental phenomenon by which a wave packet undergoes a periodic motion in a lattice when subjected to a force. Observed in a wide range of synthetic systems, BOs are intrinsically related to geometric and topological properties of the underlying band structure. This...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7684321/ https://www.ncbi.nlm.nih.gov/pubmed/33230167 http://dx.doi.org/10.1038/s41467-020-19518-x |
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author | Di Liberto, M. Goldman, N. Palumbo, G. |
author_facet | Di Liberto, M. Goldman, N. Palumbo, G. |
author_sort | Di Liberto, M. |
collection | PubMed |
description | Bloch oscillations (BOs) are a fundamental phenomenon by which a wave packet undergoes a periodic motion in a lattice when subjected to a force. Observed in a wide range of synthetic systems, BOs are intrinsically related to geometric and topological properties of the underlying band structure. This has established BOs as a prominent tool for the detection of Berry-phase effects, including those described by non-Abelian gauge fields. In this work, we unveil a unique topological effect that manifests in the BOs of higher-order topological insulators through the interplay of non-Abelian Berry curvature and quantized Wilson loops. It is characterized by an oscillating Hall drift synchronized with a topologically-protected inter-band beating and a multiplied Bloch period. We elucidate that the origin of this synchronization mechanism relies on the periodic quantum dynamics of Wannier centers. Our work paves the way to the experimental detection of non-Abelian topological properties through the measurement of Berry phases and center-of-mass displacements. |
format | Online Article Text |
id | pubmed-7684321 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-76843212020-12-03 Non-Abelian Bloch oscillations in higher-order topological insulators Di Liberto, M. Goldman, N. Palumbo, G. Nat Commun Article Bloch oscillations (BOs) are a fundamental phenomenon by which a wave packet undergoes a periodic motion in a lattice when subjected to a force. Observed in a wide range of synthetic systems, BOs are intrinsically related to geometric and topological properties of the underlying band structure. This has established BOs as a prominent tool for the detection of Berry-phase effects, including those described by non-Abelian gauge fields. In this work, we unveil a unique topological effect that manifests in the BOs of higher-order topological insulators through the interplay of non-Abelian Berry curvature and quantized Wilson loops. It is characterized by an oscillating Hall drift synchronized with a topologically-protected inter-band beating and a multiplied Bloch period. We elucidate that the origin of this synchronization mechanism relies on the periodic quantum dynamics of Wannier centers. Our work paves the way to the experimental detection of non-Abelian topological properties through the measurement of Berry phases and center-of-mass displacements. Nature Publishing Group UK 2020-11-23 /pmc/articles/PMC7684321/ /pubmed/33230167 http://dx.doi.org/10.1038/s41467-020-19518-x Text en © The Author(s) 2020 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 Di Liberto, M. Goldman, N. Palumbo, G. Non-Abelian Bloch oscillations in higher-order topological insulators |
title | Non-Abelian Bloch oscillations in higher-order topological insulators |
title_full | Non-Abelian Bloch oscillations in higher-order topological insulators |
title_fullStr | Non-Abelian Bloch oscillations in higher-order topological insulators |
title_full_unstemmed | Non-Abelian Bloch oscillations in higher-order topological insulators |
title_short | Non-Abelian Bloch oscillations in higher-order topological insulators |
title_sort | non-abelian bloch oscillations in higher-order topological insulators |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7684321/ https://www.ncbi.nlm.nih.gov/pubmed/33230167 http://dx.doi.org/10.1038/s41467-020-19518-x |
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