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Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields
The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Néel ordered. Here, we report high r...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6408591/ https://www.ncbi.nlm.nih.gov/pubmed/30850591 http://dx.doi.org/10.1038/s41467-019-08715-y |
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author | Gannon, W. J. Zaliznyak, I. A. Wu, L. S. Feiguin, A. E. Tsvelik, A. M. Demmel, F. Qiu, Y. Copley, J. R. D. Kim, M. S. Aronson, M. C. |
author_facet | Gannon, W. J. Zaliznyak, I. A. Wu, L. S. Feiguin, A. E. Tsvelik, A. M. Demmel, F. Qiu, Y. Copley, J. R. D. Kim, M. S. Aronson, M. C. |
author_sort | Gannon, W. J. |
collection | PubMed |
description | The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Néel ordered. Here, we report high resolution neutron scattering experiments, which reveal how a magnetic field closes this gap and drives the spin chains in Yb(2)Pt(2)Pb to a critical, disordered Luttinger-liquid state. In Yb(2)Pt(2)Pb the effective spins-1/2 describe the dynamics of large, Ising-like Yb magnetic moments, ensuring that the measured excitations are exclusively longitudinal, which we find to be well described by time-dependent density matrix renormalization group calculations. The inter-chain coupling leads to the confinement of spinons, a condensed matter analog of quark confinement in quantum chromodynamics. Insensitive to transverse fluctuations, our measurements show how a gapless, dispersive longitudinal mode arises from confinement and evolves with magnetic order. |
format | Online Article Text |
id | pubmed-6408591 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-64085912019-03-11 Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields Gannon, W. J. Zaliznyak, I. A. Wu, L. S. Feiguin, A. E. Tsvelik, A. M. Demmel, F. Qiu, Y. Copley, J. R. D. Kim, M. S. Aronson, M. C. Nat Commun Article The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Néel ordered. Here, we report high resolution neutron scattering experiments, which reveal how a magnetic field closes this gap and drives the spin chains in Yb(2)Pt(2)Pb to a critical, disordered Luttinger-liquid state. In Yb(2)Pt(2)Pb the effective spins-1/2 describe the dynamics of large, Ising-like Yb magnetic moments, ensuring that the measured excitations are exclusively longitudinal, which we find to be well described by time-dependent density matrix renormalization group calculations. The inter-chain coupling leads to the confinement of spinons, a condensed matter analog of quark confinement in quantum chromodynamics. Insensitive to transverse fluctuations, our measurements show how a gapless, dispersive longitudinal mode arises from confinement and evolves with magnetic order. Nature Publishing Group UK 2019-03-08 /pmc/articles/PMC6408591/ /pubmed/30850591 http://dx.doi.org/10.1038/s41467-019-08715-y 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 Gannon, W. J. Zaliznyak, I. A. Wu, L. S. Feiguin, A. E. Tsvelik, A. M. Demmel, F. Qiu, Y. Copley, J. R. D. Kim, M. S. Aronson, M. C. Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title | Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title_full | Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title_fullStr | Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title_full_unstemmed | Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title_short | Spinon confinement and a sharp longitudinal mode in Yb(2)Pt(2)Pb in magnetic fields |
title_sort | spinon confinement and a sharp longitudinal mode in yb(2)pt(2)pb in magnetic fields |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6408591/ https://www.ncbi.nlm.nih.gov/pubmed/30850591 http://dx.doi.org/10.1038/s41467-019-08715-y |
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