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Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse an...

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Autores principales: Do, Seung-Hwan, Zhang, Hao, Williams, Travis J., Hong, Tao, Garlea, V. Ovidiu, Rodriguez-Rivera, J. A., Jang, Tae-Hwan, Cheong, Sang-Wook, Park, Jae-Hoon, Batista, Cristian D., Christianson, Andrew D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8429660/
https://www.ncbi.nlm.nih.gov/pubmed/34504075
http://dx.doi.org/10.1038/s41467-021-25591-7
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author Do, Seung-Hwan
Zhang, Hao
Williams, Travis J.
Hong, Tao
Garlea, V. Ovidiu
Rodriguez-Rivera, J. A.
Jang, Tae-Hwan
Cheong, Sang-Wook
Park, Jae-Hoon
Batista, Cristian D.
Christianson, Andrew D.
author_facet Do, Seung-Hwan
Zhang, Hao
Williams, Travis J.
Hong, Tao
Garlea, V. Ovidiu
Rodriguez-Rivera, J. A.
Jang, Tae-Hwan
Cheong, Sang-Wook
Park, Jae-Hoon
Batista, Cristian D.
Christianson, Andrew D.
author_sort Do, Seung-Hwan
collection PubMed
description An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba(2)FeSi(2)O(7) reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode.
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spelling pubmed-84296602021-09-24 Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet Do, Seung-Hwan Zhang, Hao Williams, Travis J. Hong, Tao Garlea, V. Ovidiu Rodriguez-Rivera, J. A. Jang, Tae-Hwan Cheong, Sang-Wook Park, Jae-Hoon Batista, Cristian D. Christianson, Andrew D. Nat Commun Article An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba(2)FeSi(2)O(7) reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode. Nature Publishing Group UK 2021-09-09 /pmc/articles/PMC8429660/ /pubmed/34504075 http://dx.doi.org/10.1038/s41467-021-25591-7 Text en © The Author(s) 2021 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
Do, Seung-Hwan
Zhang, Hao
Williams, Travis J.
Hong, Tao
Garlea, V. Ovidiu
Rodriguez-Rivera, J. A.
Jang, Tae-Hwan
Cheong, Sang-Wook
Park, Jae-Hoon
Batista, Cristian D.
Christianson, Andrew D.
Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title_full Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title_fullStr Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title_full_unstemmed Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title_short Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
title_sort decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8429660/
https://www.ncbi.nlm.nih.gov/pubmed/34504075
http://dx.doi.org/10.1038/s41467-021-25591-7
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