Coexistence of Canted Antiferromagnetism and Bond Order in ν=0 Graphene

Motivated by experimental studies of graphene in the quantum Hall regime, we revisit the phase diagram of a single sheet of graphene at charge neutrality. Because of spin and valley degeneracies, interactions play a crucial role in determining the nature of the ground state. We show that, genericall...

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Bibliographic Details
Published inPhysical review letters Vol. 128; no. 10; p. 106803
Main Authors Das, Ankur, Kaul, Ribhu K, Murthy, Ganpathy
Format Journal Article
LanguageEnglish
Published United States 11.03.2022
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Summary:Motivated by experimental studies of graphene in the quantum Hall regime, we revisit the phase diagram of a single sheet of graphene at charge neutrality. Because of spin and valley degeneracies, interactions play a crucial role in determining the nature of the ground state. We show that, generically within the Hartree-Fock approximation, in the regime of interest there is a region of coexistence between magnetic and bond orders in the phase diagram. We demonstrate this result both in continuum and lattice models, and argue that the coexistence phase naturally provides a possible explanation for unreconciled experimental observations on the quantum Hall effect in graphene.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.128.106803