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

Ankur Das, Ribhu K. Kaul, Ganpathy Murthy

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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.

Original languageEnglish
Article number106803
JournalPhysical Review Letters
Volume128
Issue number10
DOIs
StatePublished - Mar 11 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

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