2021/09/17 by D. C. Padilla-González, Padilla-González, D. C., R. Franco +3
Physics and Astronomy · #Physics of Superconductivity and Magnetism
paper · pdf · doi:10.48550/arxiv.2109.08716
We investigated the ionic Hubbard model with mass imbalance in one dimension, using the density matrix renormalization group method. This model exhibits a band insulator phase and an antiferromagnetic one, both with a finite spin gap. We found that this quantum phase transition is continuous, unalike the previous mean-field theory result. The von Neumann block entropy is maximum at the critical points, a fact that we used to build the phase diagram.