Finite-temperature phase transitions in the ionic Hubbard model
arXiv:1405.4511 · doi:10.1103/PhysRevB.89.165117
Abstract
We investigate paramagnetic metal-insulator transitions in the infinite-dimensional ionic Hubbard model at finite temperatures. By means of the dynamical mean-field theory with an impurity solver of the continuous-time quantum Monte Carlo method, we show that an increase in the interaction strength brings about a crossover from a band insulating phase to a metallic one, followed by a first-order transition to a Mott insulating phase. The first-order transition turns into a crossover above a certain critical temperature, which becomes higher as the staggered lattice potential is increased. Further, analysis of the temperature dependence of the energy density discloses that the intermediate metallic phase is a Fermi liquid. It is also found that the metallic phase is stable against strong staggered potentials even at very low temperatures.
8 pages, 10 figures
References in corpus (11)
- Continuous-time Monte Carlo methods for quantum impurity models
- Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
- Momentum space anisotropy and pseudogaps: a comparative cluster dynamical mean field analysis of the doping-driven metal-insulator transition in the two dimensional Hubbard model
- Local Order and the gapped phase of the Hubbard model: a plaquette dynamical mean field investigation
- Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
- Metallic phase in the two-dimensional ionic Hubbard model
- Temperature dependent correlations in covalent insulators
- Electronic phase transitions in the half-filled ionic Hubbard model
- Insulating behavior with spin and charge order in the ionic Hubbard model
- Band-Insulator-Metal-Mott-Insulator transition in the half--filled ionic-Hubbard chain
- Estimate of the Phase Transition Line in the Infinite-dimensional Hubbard Model