Correlated Dirac semimetal by periodized cluster dynamical mean-field theory
arXiv:1507.02495 · doi:10.1103/PhysRevB.92.155127
Abstract
The periodized cluster dynamical mean-field theory (PCDMFT) combined with exact diagonalization as impurity solver has been applied to the half-filled standard Hubbard model on the honeycomb lattice. A correlated Dirac semimetal is found for weak interactions and it transforms into an antiferromagnetic insulating phase for strong interactions via a first-order quantum phase transition, not intervened by a spin liquid phase in between. In this application, the PCDMFT introduces the partial translation symmetry, but cures well the problem due to the translation symmetry breaking in the cluster dynamical mean-field theory studies for the same model, which give rise to a spurious insulating phase in the weakly interacting region.
5 pages and 5 figures
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- Absence of Spin Liquid in the Hubbard model on the Honeycomb Lattice
- PhD Thesis: Electronic correlations in multiorbital systems