Fractional Chiral Hinge Insulator

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dc.citation.issue16
dc.citation.rankM21
dc.citation.spageL161110
dc.citation.volume103
dc.contributor.authorHackenbroich, Anna
dc.contributor.authorHudomal, Ana
dc.contributor.authorSchuch, Norbert
dc.contributor.authorBernevig, B. Andrei
dc.contributor.authorRegnault, Nicolas
dc.date.accessioned2024-06-14T09:59:47Z
dc.date.available2024-06-14T09:59:47Z
dc.date.issued2021-04-23
dc.description.abstractWe propose and study a wave function describing an interacting three-dimensional fractional chiral hinge insulator (FCHI) constructed by Gutzwiller projection of two noninteracting second-order topological insulators with chiral hinge modes at half filling. We use large-scale variational Monte Carlo computations to characterize the model states via the entanglement entropy and charge-spin fluctuations. We show that the FCHI possesses fractional chiral hinge modes characterized by a central charge c=1 and Luttinger parameter K=1/2, like the edge modes of a Laughlin 1/2 state. The bulk and surface topology is characterized by the topological entanglement entropy (TEE) correction to the area law. While our computations indicate a vanishing bulk TEE, we show that the gapped surfaces host an unconventional two-dimensional topological phase. In a clear departure from the physics of a Laughlin 1/2 state, we find a TEE per surface compatible with (ln2)/2, half that of a Laughlin 1/2 state. This value cannot be obtained from topological quantum field theory for purely two-dimensional systems. For the sake of completeness, we also investigate the topological degeneracy.
dc.identifier10.1103/PhysRevB.103.L161110
dc.identifier.doi10.1103/PhysRevB.103.L161110
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.other2010.09728v1
dc.identifier.scopus2-s2.0-85105461123
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/96
dc.identifier.wos000647174100007
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review B
dc.relation.ispartofabbrPhys. Rev. B
dc.rightsrestrictedAccess
dc.sourcePhys. Rev. B 103, 161110 (2021)
dc.subjectcond-mat.str-el
dc.titleFractional Chiral Hinge Insulator
dc.typeArticle
dc.type.versionpublishedVersion
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