# 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…

## 4 Citations

Topological Phase Transitions in the Repulsively Interacting Haldane-Hubbard Model.

- Physics, MedicinePhysical review letters
- 2016

Using dynamical mean-field theory and exact diagonalization, the phase diagram of the repulsive Haldane-Hubbard model is studied, varying the interaction strength and the sublattice potential difference to explain the latter phase by a spontaneous symmetry breaking.

Interaction-driven topological phase transitions in fermionic SU(3) systems

- Physics
- 2020

We consider SU(3) fermions on the triangular lattice in the presence of a gauge potential which stabilizes a quantum Hall insulator (QHI) at the density of one particle per lattice site. We…

Quantum phase transitions in the two dimensional ionic-Hubbard model

- PhysicsChinese Journal of Physics
- 2019

We employ the dynamical mean field approximation to study the effects of ionic potential ($\Delta$) and on-site electron correlation ($U$) on 2D square lattice. At half-filling when the staggered…

Intermediate phase in interacting Dirac fermions with staggered potential

- Physics
- 2020

By performing exact quantum Monte Carlo simulations of a model of interacting Dirac Fermions with staggered potential, we reveal a novel intermediate phase where the electronic correlations drive a…

## References

SHOWING 1-10 OF 57 REFERENCES

Exact diagonalization study of 2D Hubbard model on honeycomb lattice: Semi-metal to insulator transition

- Physics
- 2011

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 low…

Quantum critical behavior of the one-dimensional ionic Hubbard model

- Physics
- 2004

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 alternating…

Metallic phase in the two-dimensional ionic Hubbard model

- Physics
- 2007

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 staggered…

Semi-Metal-Insulator Transition of the Hubbard Model in the Honeycomb Lattice

- Physics
- 1992

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 the…

Band and Mott Insulators and Superconductivity in Honeycomb-Lattice Ionic-Hubbard Model

- Physics
- 2013

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 optimization…

Dispersive excitations in one-dimensional ionic Hubbard model

- Physics
- 2014

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 which…

Short-range Coulomb correlations render massive Dirac fermions massless

- Physics
- 2012

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 the…

Dirac-point engineering and topological phase transitions in honeycomb optical lattices

- Physics
- 2008

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 the…

Can correlations drive a band insulator metallic?

- Physics, MedicinePhysical review letters
- 2006

The surprising result is found that the gap is suppressed to zero at a critical Uc1 and remains zero within a metallic phase.

Interacting Dirac fermions on honeycomb lattice

- Physics
- 2010

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 the…