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Article: Quantum anomalous Hall effect in a flat band ferromagnet

TitleQuantum anomalous Hall effect in a flat band ferromagnet
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 8, article no. 085209 How to Cite?
AbstractWe proposed a theory of quantum anomalous Hall effect in a flat band ferromagnet on a two-dimensional decorated lattice with spin-orbit coupling. Free electrons on the lattice have dispersionless flat bands, and the ground state is highly degenerate when each lattice site is occupied averagely by one electron, i.e., the system is at half filling. The onsite Coulomb interaction can remove the degeneracy and give rise to the ferrimagnetism, which is the coexistence of the ferromagnetic and antiferromagnetic long-range orders. On the other hand, the spin-orbit coupling makes the band structure topologically nontrivial, and produces the quantum spin Hall effect with a pair of helical edge states around the system boundary. Based on the rigorous results for the Hubbard model, we found that the Coulomb interaction can provide an effective staggered potential and turn the quantum spin Hall phase into a quantum anomalous Hall phase. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/146411
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongN_HKU 748/10
Funding Information:

This work was supported by the Research Grant Council of Hong Kong under Grant No. N_HKU 748/10.

Grants

 

DC FieldValueLanguage
dc.contributor.authorZhao, Aen_US
dc.contributor.authorShen, SQen_US
dc.date.accessioned2012-04-24T07:52:13Z-
dc.date.available2012-04-24T07:52:13Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2012, v. 85 n. 8, article no. 085209en_US
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/146411-
dc.description.abstractWe proposed a theory of quantum anomalous Hall effect in a flat band ferromagnet on a two-dimensional decorated lattice with spin-orbit coupling. Free electrons on the lattice have dispersionless flat bands, and the ground state is highly degenerate when each lattice site is occupied averagely by one electron, i.e., the system is at half filling. The onsite Coulomb interaction can remove the degeneracy and give rise to the ferrimagnetism, which is the coexistence of the ferromagnetic and antiferromagnetic long-range orders. On the other hand, the spin-orbit coupling makes the band structure topologically nontrivial, and produces the quantum spin Hall effect with a pair of helical edge states around the system boundary. Based on the rigorous results for the Hubbard model, we found that the Coulomb interaction can provide an effective staggered potential and turn the quantum spin Hall phase into a quantum anomalous Hall phase. © 2012 American Physical Society.-
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_US
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.titleQuantum anomalous Hall effect in a flat band ferromagneten_US
dc.typeArticleen_US
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_US
dc.identifier.authorityShen, S=rp00775en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.85.085209-
dc.identifier.scopuseid_2-s2.0-84857764227-
dc.identifier.hkuros199349en_US
dc.identifier.volume85en_US
dc.identifier.issue8, article no. 085209-
dc.identifier.isiWOS:000300566900006-
dc.publisher.placeUnited Statesen_US
dc.relation.projectNovel quantum states of ultracold atoms in optical lattices-

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