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Journal Article | PreJuSER-18487 |
2011
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/10896 doi:10.1103/PhysRevB.83.035113
Abstract: The role of nonlocal Coulomb correlations in the honeycomb lattice is investigated within cluster dynamical mean field theory combined with finite-temperature exact diagonalization. The paramagnetic semimetal-to-insulator transition is found to be in excellent agreement with finite-size determinantal quantum Monte Carlo simulations and with cluster dynamical mean field calculations based on the continuous-time quantum Monte Carlo approach. As expected, the critical Coulomb energy is much lower than within a local or single-site formulation. Short-range correlations are shown to give rise to a pseudogap and concomitant non-Fermi-liquid behavior within a narrow range below the Mott transition.
Keyword(s): J
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