The ground state of neutral graphene in a strong magnetic field switches from antiferromagnetic to Kekulé-distorted as screening and field decrease, with the Dirac sea providing the decisive energy difference.
(65),ΣC nξ,n′ξ′ is contributed by the following matrix elementsVnξ,n2ξ2,n3ξ3,n′ξ′
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Influence of the Dirac Sea on Phase Transitions in Monolayer Graphene under Strong Magnetic Fields
The ground state of neutral graphene in a strong magnetic field switches from antiferromagnetic to Kekulé-distorted as screening and field decrease, with the Dirac sea providing the decisive energy difference.