Energy dynamics in the Heisenberg-Kitaev spin chain

DC FieldValueLanguage
dc.contributor.authorSteinigeweg, Robin
dc.contributor.authorBrenig, Wolfram
dc.date.accessioned2021-12-23T16:10:36Z-
dc.date.available2021-12-23T16:10:36Z-
dc.date.issued2016
dc.identifier.issn24699950
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/9311-
dc.description.abstractWe study the Heisenberg-Kitaev spin chain in order to uncover the interplay between two qualitatively different integrable points in the physics of heat transport in one dimension. Focusing on high temperatures and using analytical as well as numerical approaches within linear response theory, we explore several directions in parameter space including exchange-coupling ratios, anisotropies, and external magnetic fields. We show the emergence of purely ballistic energy transport at all integrable points, manifest in pronounced Drude weights and low-frequency suppression of regular-conductivity contributions. Moreover, off integrability, we find extended quantum chaotic regions with vanishing Drude weights and well-defined dc conductivities. In the vicinity of the Kitaev point, we observe clear signatures of the topological gap in the response function. This gap coexists with a nonzero Drude weight in the Kitaev chain.
dc.description.sponsorshipDFGGerman Research Foundation (DFG)European Commission [FOR912, BR 1084/6-2, SFB 1143]; EU MC-ITN LOTHERM [PITN-GA-2009-238475]; We sincerely thank P. Recher and L. Weithofer for fruitful discussions. This work has been supported in part by DFG FOR912 Grant No. BR 1084/6-2, EU MC-ITN LOTHERM Grant No. PITN-GA-2009-238475, and DFG SFB 1143. W.B. also acknowledges kind hospitality of the PSM Dresden.
dc.language.isoen
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofPHYSICAL REVIEW B
dc.subjectMaterials Science
dc.subjectMaterials Science, Multidisciplinary
dc.subjectPhysics
dc.subjectPhysics, Applied
dc.subjectPhysics, Condensed Matter
dc.subjectTHERMAL-CONDUCTIVITY
dc.subjectTRANSPORT
dc.titleEnergy dynamics in the Heisenberg-Kitaev spin chain
dc.typejournal article
dc.identifier.doi10.1103/PhysRevB.93.214425
dc.identifier.isiISI:000378104000003
dc.description.volume93
dc.description.issue21
dc.contributor.orcid0000-0003-0608-0884
dc.contributor.researcheridA-5205-2009
dc.identifier.eissn24699969
dc.publisher.placeONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
dcterms.isPartOf.abbreviationPhys. Rev. B
dcterms.oaStatusGreen Submitted
crisitem.author.deptFB 04 - Physik-
crisitem.author.deptidfb04-
crisitem.author.orcid0000-0003-0608-0884-
crisitem.author.parentorgUniversität Osnabrück-
crisitem.author.netidStRo766-
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