Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory
Strongly Correlated Electrons
2015-05-20 v1
Abstract
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.
Keywords
Cite
@article{arxiv.1010.4733,
title = {Correlated Dirac Fermions on the Honeycomb Lattice studied within Cluster Dynamical Mean Field Theory},
author = {A. Liebsch},
journal= {arXiv preprint arXiv:1010.4733},
year = {2015}
}
Comments
8 pages, 6 figures