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Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality

Quantum spin liquids (QSLs) are exotic phases of matter that host fractionalized excitations. It is difficult for local probes to characterize QSL, whereas quantum entanglement can serve as a powerful diagnostic tool due to its nonlocality. The kagome antiferromagnetic Heisenberg model is one of the...

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Detalles Bibliográficos
Autores principales: Zhu, Wei, Chen, Xiao, He, Yin-Chen, Witczak-Krempa, William
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6263211/
https://www.ncbi.nlm.nih.gov/pubmed/30511016
http://dx.doi.org/10.1126/sciadv.aat5535
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author Zhu, Wei
Chen, Xiao
He, Yin-Chen
Witczak-Krempa, William
author_facet Zhu, Wei
Chen, Xiao
He, Yin-Chen
Witczak-Krempa, William
author_sort Zhu, Wei
collection PubMed
description Quantum spin liquids (QSLs) are exotic phases of matter that host fractionalized excitations. It is difficult for local probes to characterize QSL, whereas quantum entanglement can serve as a powerful diagnostic tool due to its nonlocality. The kagome antiferromagnetic Heisenberg model is one of the most studied and experimentally relevant models for QSL, but its solution remains under debate. Here, we perform a numerical Aharonov-Bohm experiment on this model and uncover universal features of the entanglement entropy. By means of the density matrix renormalization group, we reveal the entanglement signatures of emergent Dirac spinons, which are the fractionalized excitations of the QSL. This scheme provides qualitative insights into the nature of kagome QSL and can be used to study other quantum states of matter. As a concrete example, we also benchmark our methods on an interacting quantum critical point between a Dirac semimetal and a charge-ordered phase.
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spelling pubmed-62632112018-12-03 Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality Zhu, Wei Chen, Xiao He, Yin-Chen Witczak-Krempa, William Sci Adv Research Articles Quantum spin liquids (QSLs) are exotic phases of matter that host fractionalized excitations. It is difficult for local probes to characterize QSL, whereas quantum entanglement can serve as a powerful diagnostic tool due to its nonlocality. The kagome antiferromagnetic Heisenberg model is one of the most studied and experimentally relevant models for QSL, but its solution remains under debate. Here, we perform a numerical Aharonov-Bohm experiment on this model and uncover universal features of the entanglement entropy. By means of the density matrix renormalization group, we reveal the entanglement signatures of emergent Dirac spinons, which are the fractionalized excitations of the QSL. This scheme provides qualitative insights into the nature of kagome QSL and can be used to study other quantum states of matter. As a concrete example, we also benchmark our methods on an interacting quantum critical point between a Dirac semimetal and a charge-ordered phase. American Association for the Advancement of Science 2018-11-09 /pmc/articles/PMC6263211/ /pubmed/30511016 http://dx.doi.org/10.1126/sciadv.aat5535 Text en Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Zhu, Wei
Chen, Xiao
He, Yin-Chen
Witczak-Krempa, William
Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title_full Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title_fullStr Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title_full_unstemmed Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title_short Entanglement signatures of emergent Dirac fermions: Kagome spin liquid and quantum criticality
title_sort entanglement signatures of emergent dirac fermions: kagome spin liquid and quantum criticality
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6263211/
https://www.ncbi.nlm.nih.gov/pubmed/30511016
http://dx.doi.org/10.1126/sciadv.aat5535
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