Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory

Details Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory

2010-10-22

arxiv.org/abs/1010.4733v1

Phy. Rev. B 83, 035113 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

The role of non-local Coulomb correlations in the honeycomb lattice is investigated within cluster dynamical mean field theory combined with finite-temperature exact diagonalization. The paramagnetic semi-metal 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.

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