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.
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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.