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Article: Diagnosis of Interaction-driven Topological Phase via Exact Diagonalization

TitleDiagnosis of Interaction-driven Topological Phase via Exact Diagonalization
Authors
Issue Date2016
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prl/
Citation
Physical Review Letters, 2016, v. 117 n. 6, article no. 066403 How to Cite?
Abstract© 2016 American Physical Society. We propose a general scheme for diagnosing interaction-driven topological phases in the weak interaction regime using exact diagonalization (ED). The scheme comprises the analysis of eigenvalues of the point-group operators for the many-body eigenstates and the correlation functions for physical observables to extract the symmetries of the order parameters and the topological numbers of the underlying ground states at the thermodynamic limit from a relatively small size system afforded by ED. As a concrete example, we investigate the interaction effects on the half-filled spinless fermions on the checkerboard lattice with a quadratic band crossing point. Numerical results support the existence of a spontaneous quantum anomalous Hall phase purely driven by a nearest-neighbor weak repulsive interaction, separated from a nematic Mott insulator phase at strong repulsive interaction by a first-order phase transition.
Persistent Identifierhttp://hdl.handle.net/10722/268583
ISSN
2021 Impact Factor: 9.185
2020 SCImago Journal Rankings: 3.688
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Han Qing-
dc.contributor.authorHe, Yuan Yao-
dc.contributor.authorFang, Chen-
dc.contributor.authorMeng, Zi Yang-
dc.contributor.authorLu, Zhong Yi-
dc.date.accessioned2019-03-25T08:00:07Z-
dc.date.available2019-03-25T08:00:07Z-
dc.date.issued2016-
dc.identifier.citationPhysical Review Letters, 2016, v. 117 n. 6, article no. 066403-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/268583-
dc.description.abstract© 2016 American Physical Society. We propose a general scheme for diagnosing interaction-driven topological phases in the weak interaction regime using exact diagonalization (ED). The scheme comprises the analysis of eigenvalues of the point-group operators for the many-body eigenstates and the correlation functions for physical observables to extract the symmetries of the order parameters and the topological numbers of the underlying ground states at the thermodynamic limit from a relatively small size system afforded by ED. As a concrete example, we investigate the interaction effects on the half-filled spinless fermions on the checkerboard lattice with a quadratic band crossing point. Numerical results support the existence of a spontaneous quantum anomalous Hall phase purely driven by a nearest-neighbor weak repulsive interaction, separated from a nematic Mott insulator phase at strong repulsive interaction by a first-order phase transition.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.titleDiagnosis of Interaction-driven Topological Phase via Exact Diagonalization-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevLett.117.066403-
dc.identifier.scopuseid_2-s2.0-84982134972-
dc.identifier.volume117-
dc.identifier.issue6-
dc.identifier.spagearticle no. 066403-
dc.identifier.epagearticle no. 066403-
dc.identifier.eissn1079-7114-
dc.identifier.isiWOS:000381442800011-
dc.identifier.issnl0031-9007-

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