Effects of correlations on honeycomb lattice in ionic-Hubbard Model

@article{Ebrahimkhas2015EffectsOC,
  title={Effects of correlations on honeycomb lattice in ionic-Hubbard Model},
  author={Morad Ebrahimkhas and Z. Drezhegrighash and Elshan Soltani},
  journal={Physics Letters A},
  year={2015},
  volume={379},
  pages={1053-1056}
}
Abstract In a honeycomb lattice the symmetry has been broken by adding an ionic potential and a single-particle gap was generated in the spectrum. We have employed the iterative perturbation theory (IPT) in dynamical mean field approximation method to study the effects of competition between U and Δ on energy gap and renormalized Fermi velocity. As we found, the competition between the single-particle gap parameter and the Hubbard potential closed the energy gap and restored the semi-metallic… Expand

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References

SHOWING 1-10 OF 57 REFERENCES
Exact diagonalization study of 2D Hubbard model on honeycomb lattice: Semi-metal to insulator transition
Abstract Phase transition in a honeycomb lattice is studied by the means of the two-dimensional Hubbard model and the exact diagonalization dynamical mean field theory at zero temperature. At lowExpand
Quantum critical behavior of the one-dimensional ionic Hubbard model
We study the zero-temperature phase diagram of the half-filled one-dimensional ionic Hubbard model. This model is governed by the interplay of the on-site Coulomb repulsion and an alternatingExpand
Metallic phase in the two-dimensional ionic Hubbard model
We investigate the phases of the ionic Hubbard model in a two-dimensional square lattice using determinant quantum Monte Carlo (DQMC). At half-filling, when the interaction strength or the staggeredExpand
Semi-Metal-Insulator Transition of the Hubbard Model in the Honeycomb Lattice
Using quantum Monte Carlo and finite-size scaling for the Hubbard model, we find evidence of a zero-temperature transition between the nonmagnetic semi-metal and an antiferromagnetic insulator in theExpand
Band and Mott Insulators and Superconductivity in Honeycomb-Lattice Ionic-Hubbard Model
Motivated by superconductivity (SC) in layered nitrides, we study an ionic-Hubbard model of a honeycomb lattice, which consists of two sublattices with an energy-level offset, by an optimizationExpand
Dispersive excitations in one-dimensional ionic Hubbard model
A detailed study of the one-dimensional ionic Hubbard model with interaction $U$ is presented. We focus on the band insulating (BI) phase and the spontaneously dimerized insulating (SDI) phase whichExpand
Short-range Coulomb correlations render massive Dirac fermions massless
Tight-binding electrons on a honeycomb lattice are described by an effective Dirac theory at low energies. Lowering symmetry by an alternate ionic potential (Δ) generates a single-particle gap in theExpand
Dirac-point engineering and topological phase transitions in honeycomb optical lattices
We study the electronic structure and the phase diagram of non-interacting fermions confined to hexagonal optical lattices. In the first part, we compare the properties of Dirac points arising in theExpand
Can correlations drive a band insulator metallic?
TLDR
The surprising result is found that the gap is suppressed to zero at a critical Uc1 and remains zero within a metallic phase. Expand
Interacting Dirac fermions on honeycomb lattice
We investigate the interacting Dirac fermions on honeycomb lattice by cluster dynamical mean-field theory (DMFT) combined with continuous-time quantum Monte Carlo simulation. A novel scenario for theExpand
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