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Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet

Search for topological materials has been actively promoted in the field of condensed matter physics for their potential application in energy-efficient information transmission and processing. Recent studies have revealed that topologically invariant states, such as edge states in topological insul...

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Autores principales: Nawa, Kazuhiro, Tanaka, Kimihiko, Kurita, Nobuyuki, Sato, Taku J., Sugiyama, Haruki, Uekusa, Hidehiro, Ohira-Kawamura, Seiko, Nakajima, Kenji, Tanaka, Hidekazu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6506493/
https://www.ncbi.nlm.nih.gov/pubmed/31068576
http://dx.doi.org/10.1038/s41467-019-10091-6
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author Nawa, Kazuhiro
Tanaka, Kimihiko
Kurita, Nobuyuki
Sato, Taku J.
Sugiyama, Haruki
Uekusa, Hidehiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Tanaka, Hidekazu
author_facet Nawa, Kazuhiro
Tanaka, Kimihiko
Kurita, Nobuyuki
Sato, Taku J.
Sugiyama, Haruki
Uekusa, Hidehiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Tanaka, Hidekazu
author_sort Nawa, Kazuhiro
collection PubMed
description Search for topological materials has been actively promoted in the field of condensed matter physics for their potential application in energy-efficient information transmission and processing. Recent studies have revealed that topologically invariant states, such as edge states in topological insulators, can emerge not only in a fermionic electron system but also in a bosonic system, enabling nondissipative propagation of quasiparticles. Here we report the topologically nontrivial triplon bands measured by inelastic neutron scattering on the spin-1/2 two-dimensional dimerized antiferromagnet Ba(2)CuSi(2)O(6)Cl(2). The excitation spectrum exhibits two triplon bands that are clearly separated by a band gap due to a small alternation in interdimer exchange interaction, consistent with a refined crystal structure. By analytically modeling the triplon dispersion, we show that Ba(2)CuSi(2)O(6)Cl(2) is the first bosonic realization of the coupled Su-Schrieffer-Heeger model, where the presence of topologically protected edge states is prompted by a bipartite nature of the lattice.
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spelling pubmed-65064932019-05-10 Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet Nawa, Kazuhiro Tanaka, Kimihiko Kurita, Nobuyuki Sato, Taku J. Sugiyama, Haruki Uekusa, Hidehiro Ohira-Kawamura, Seiko Nakajima, Kenji Tanaka, Hidekazu Nat Commun Article Search for topological materials has been actively promoted in the field of condensed matter physics for their potential application in energy-efficient information transmission and processing. Recent studies have revealed that topologically invariant states, such as edge states in topological insulators, can emerge not only in a fermionic electron system but also in a bosonic system, enabling nondissipative propagation of quasiparticles. Here we report the topologically nontrivial triplon bands measured by inelastic neutron scattering on the spin-1/2 two-dimensional dimerized antiferromagnet Ba(2)CuSi(2)O(6)Cl(2). The excitation spectrum exhibits two triplon bands that are clearly separated by a band gap due to a small alternation in interdimer exchange interaction, consistent with a refined crystal structure. By analytically modeling the triplon dispersion, we show that Ba(2)CuSi(2)O(6)Cl(2) is the first bosonic realization of the coupled Su-Schrieffer-Heeger model, where the presence of topologically protected edge states is prompted by a bipartite nature of the lattice. Nature Publishing Group UK 2019-05-08 /pmc/articles/PMC6506493/ /pubmed/31068576 http://dx.doi.org/10.1038/s41467-019-10091-6 Text en © The Author(s) 2019 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
Nawa, Kazuhiro
Tanaka, Kimihiko
Kurita, Nobuyuki
Sato, Taku J.
Sugiyama, Haruki
Uekusa, Hidehiro
Ohira-Kawamura, Seiko
Nakajima, Kenji
Tanaka, Hidekazu
Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title_full Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title_fullStr Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title_full_unstemmed Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title_short Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
title_sort triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6506493/
https://www.ncbi.nlm.nih.gov/pubmed/31068576
http://dx.doi.org/10.1038/s41467-019-10091-6
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