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Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets
We analyze the topology, dispersion, and optical selection rules of bulk Wannier excitons in nanosheets of Bi(2)Se(3), a topological insulator in the family of the bismuth chalcogenides. Our main finding is that excitons also inherit the topology of the electronic bands, quantified by the skyrmion w...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10113227/ https://www.ncbi.nlm.nih.gov/pubmed/37072513 http://dx.doi.org/10.1038/s41598-023-32740-z |
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author | Maisel Licerán, Lucas García Flórez, Francisco Siebbeles, Laurens D. A. Stoof, Henk T. C. |
author_facet | Maisel Licerán, Lucas García Flórez, Francisco Siebbeles, Laurens D. A. Stoof, Henk T. C. |
author_sort | Maisel Licerán, Lucas |
collection | PubMed |
description | We analyze the topology, dispersion, and optical selection rules of bulk Wannier excitons in nanosheets of Bi(2)Se(3), a topological insulator in the family of the bismuth chalcogenides. Our main finding is that excitons also inherit the topology of the electronic bands, quantified by the skyrmion winding numbers of the constituent electron and hole pseudospins as a function of the total exciton momentum. The excitonic bands are found to be strongly indirect due to the band inversion of the underlying single-particle model. At zero total momentum, we predict that the s-wave and d-wave states of two exciton families are selectively bright under left- or right-circularly polarized light. We furthermore show that every s-wave exciton state consists of a quartet with a degenerate and quadratically dispersing nonchiral doublet, and a chiral doublet with one linearly dispersing mode as in transition metal dichalcogenides. Finally, we discuss the potential existence of topological edge states of chiral excitons arising from the bulk-boundary correspondence. |
format | Online Article Text |
id | pubmed-10113227 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-101132272023-04-20 Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets Maisel Licerán, Lucas García Flórez, Francisco Siebbeles, Laurens D. A. Stoof, Henk T. C. Sci Rep Article We analyze the topology, dispersion, and optical selection rules of bulk Wannier excitons in nanosheets of Bi(2)Se(3), a topological insulator in the family of the bismuth chalcogenides. Our main finding is that excitons also inherit the topology of the electronic bands, quantified by the skyrmion winding numbers of the constituent electron and hole pseudospins as a function of the total exciton momentum. The excitonic bands are found to be strongly indirect due to the band inversion of the underlying single-particle model. At zero total momentum, we predict that the s-wave and d-wave states of two exciton families are selectively bright under left- or right-circularly polarized light. We furthermore show that every s-wave exciton state consists of a quartet with a degenerate and quadratically dispersing nonchiral doublet, and a chiral doublet with one linearly dispersing mode as in transition metal dichalcogenides. Finally, we discuss the potential existence of topological edge states of chiral excitons arising from the bulk-boundary correspondence. Nature Publishing Group UK 2023-04-18 /pmc/articles/PMC10113227/ /pubmed/37072513 http://dx.doi.org/10.1038/s41598-023-32740-z Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Maisel Licerán, Lucas García Flórez, Francisco Siebbeles, Laurens D. A. Stoof, Henk T. C. Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title | Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title_full | Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title_fullStr | Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title_full_unstemmed | Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title_short | Single-particle properties of topological Wannier excitons in bismuth chalcogenide nanosheets |
title_sort | single-particle properties of topological wannier excitons in bismuth chalcogenide nanosheets |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10113227/ https://www.ncbi.nlm.nih.gov/pubmed/37072513 http://dx.doi.org/10.1038/s41598-023-32740-z |
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