Abstract:Nonrelativistic electrons hopping on the honeycomb lattice of graphene emerge as massless Dirac fermions. When the on-site repulsion between electrons on a honeycomb lattice exceeds a critical value, as it is the case for the dehydrated precursor of the high-temperature superconductor Na 2 CoO 2 × yH 2 O, the system spontaneously breaks its SU(2) s spin symmetry and becomes an antiferromagnet. The emergence of antiferromagnetism is analogous to the spontaneous breakdown of the SU(2) L × SU(2) R chiral symmetry… Show more
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