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Article: Thermal Hall signatures of non-Kitaev spin liquids in honeycomb Kitaev materials

TitleThermal Hall signatures of non-Kitaev spin liquids in honeycomb Kitaev materials
Authors
KeywordsCondensed Matter Physics
Magnetism
Strongly Correlated Materials
Issue Date2019
PublisherAmerican Physical Society: Open Access. The Journal's web site is located at https://journals.aps.org/prresearch/
Citation
Physical Review Research, 2019, v. 1 n. 1, p. article no. 013014 How to Cite?
AbstractMotivated by the recent surge of field-driven phenomena discussed for Kitaev materials, in particular the experimental observation of a finite thermal Hall effect and theoretical proposals for the emergence of additional spin liquid phases beyond the conventional Kitaev spin liquid, we develop a theoretical understanding of the thermal Hall effect in honeycomb Kitaev materials in magnetic fields. Our focus is on gapless U(1) spin liquids with a spinon Fermi surface, which have been shown to arise as field-induced phases. We demonstrate that in the presence of symmetry-allowed second-neighbor Dzyaloshinskii-Moriya interactions these spin liquids give rise to a finite, nonquantized, thermal Hall conductance in a magnetic field. The microscopic origin of this thermal Hall effect can be traced back to an interplay of Dzyaloshinskii-Moriya interaction and Zeeman coupling, which generates an internal U(1) gauge flux that twists the motion of the emergent spinons. We argue that such a nonquantized thermal Hall effect is a generic response in Kitaev models for a range of couplings.
Persistent Identifierhttp://hdl.handle.net/10722/288148
ISSN

 

DC FieldValueLanguage
dc.contributor.authorGao, YH-
dc.contributor.authorHickey, C-
dc.contributor.authorXiang, T-
dc.contributor.authorTrebst, S-
dc.contributor.authorChen, G-
dc.date.accessioned2020-10-05T12:08:34Z-
dc.date.available2020-10-05T12:08:34Z-
dc.date.issued2019-
dc.identifier.citationPhysical Review Research, 2019, v. 1 n. 1, p. article no. 013014-
dc.identifier.issn2643-1564-
dc.identifier.urihttp://hdl.handle.net/10722/288148-
dc.description.abstractMotivated by the recent surge of field-driven phenomena discussed for Kitaev materials, in particular the experimental observation of a finite thermal Hall effect and theoretical proposals for the emergence of additional spin liquid phases beyond the conventional Kitaev spin liquid, we develop a theoretical understanding of the thermal Hall effect in honeycomb Kitaev materials in magnetic fields. Our focus is on gapless U(1) spin liquids with a spinon Fermi surface, which have been shown to arise as field-induced phases. We demonstrate that in the presence of symmetry-allowed second-neighbor Dzyaloshinskii-Moriya interactions these spin liquids give rise to a finite, nonquantized, thermal Hall conductance in a magnetic field. The microscopic origin of this thermal Hall effect can be traced back to an interplay of Dzyaloshinskii-Moriya interaction and Zeeman coupling, which generates an internal U(1) gauge flux that twists the motion of the emergent spinons. We argue that such a nonquantized thermal Hall effect is a generic response in Kitaev models for a range of couplings.-
dc.languageeng-
dc.publisherAmerican Physical Society: Open Access. The Journal's web site is located at https://journals.aps.org/prresearch/-
dc.relation.ispartofPhysical Review Research-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectCondensed Matter Physics-
dc.subjectMagnetism-
dc.subjectStrongly Correlated Materials-
dc.titleThermal Hall signatures of non-Kitaev spin liquids in honeycomb Kitaev materials-
dc.typeArticle-
dc.identifier.emailChen, G: gangchen@hku.hk-
dc.identifier.authorityChen, G=rp02491-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevResearch.1.013014-
dc.identifier.hkuros315512-
dc.identifier.volume1-
dc.identifier.issue1-
dc.identifier.spagearticle no. 013014-
dc.identifier.epagearticle no. 013014-
dc.publisher.placeUnited States-

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