Anand Sharma, Valeri N. Kotov, Antonio H. Castro Neto
We study the role of long-range electron-electron interactions in a system of two-dimensional anisotropic Dirac fermions, which naturally appears in uniaxially strained graphene, graphene in external potentials, some strongly anisotropic topological insulators, and engineered anisotropic graphene structures. We find that while for small interactions and anisotropy the system restores the conventional isotropic Dirac liquid behavior, at intermediate coupling both the anisotropy and interactions can flow, in the renormalization group sense, toward large values thus signaling the emergence of anisotropic excitonic (insulating) states, or quasi-one dimensional electronic behavior.
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http://arxiv.org/abs/1206.5427
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