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dc.contributor.authorSun, Haoen_US
dc.contributor.authorSengupta, Pinakien_US
dc.contributor.authorNam, Donguken_US
dc.contributor.authorYang, Boen_US
dc.identifier.citationSun, H., Sengupta, P., Nam, D. & Yang, B. (2021). Negative thermal Hall conductance in a two-dimer Shastry-Sutherland model with a π-flux Dirac triplon. Physical Review B, 103, L140404-.
dc.description.abstractWe introduce an effective two-dimer tight-binding model for the family of Shastry-Sutherland models with geometrically tunable triplon excitations. The Rashba pseudospin-orbit coupling induced by the tilted external magnetic field leads to elementary excitations having nontrivial topological properties with π-Berry flux. The interplay between the in-plane and out-of-plane magnetic field thus allows us to effectively engineer the band structure in this bosonic system. In particular, the in-plane magnetic field gives rise to a Berry curvature hotspot near the bottom of the triplon band and at the same time significantly increases the critical magnetic field for the topological triplon band. We calculate explicitly the experimental signature of the thermal Hall effect (THE) of triplons in SrCu2(BO3)2 and show pronounced and tunabled transport signals within the accessible parameter range, particularly with a change of sign of the thermal Hall conductance. The tilted magnetic field is also useful in reducing the bandwidth of the lowest triplon band. We show it can thus be a flexible theoretical and experimental platform for the correlated bosonic topological system.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation2019-T1-002-050 (RG 148/19 (S))en_US
dc.relation.ispartofPhysical Review Ben_US
dc.rights© 2021 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.en_US
dc.titleNegative thermal Hall conductance in a two-dimer Shastry-Sutherland model with a π-flux Dirac triplonen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.organizationInstitute of High Performance Computing, A*STARen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsCopper Compoundsen_US
dc.description.acknowledgementY.B. would like to acknowledge the support by the National Research Foundation, Singapore under the NRF fellowship award (NRF-NRFF12-2020-005). S.H. and D.N. would like to acknowledge the support by Ministry of Education, Singapore, under Grant No. AcRF TIER 1 2019-T1-002-050 (RG 148/19 (S)). P.S. acknowledges financial support from the Ministry of Education, Singapore through MOE2018-T1-001-021.en_US
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