We study the effect of disorder and doping on the metal-insulator transition in a repulsive Hubbard model on a square lattice using the determinant quantum Monte Carlo method. First, with the aim of making our results reliable, we compute the sign problem with various parameters such as temperature, disorder, on-site interactions, and lattice size. We show that in the presence of randomness in the hopping elements, the metal-insulator transition occurs and the critical disorder strength differs at different fillings. We also demonstrate that doping is a driving force behind the metal-insulator transition.
@article{arxiv.2106.03296,
title = {Doping-dependent metal-insulator transition in a disordered Hubbard model},
author = {Lingyu Tian and Yueqi Li and Ying Liang and Tianxing Ma},
journal= {arXiv preprint arXiv:2106.03296},
year = {2022}
}
Comments
Revised version. Accepted for publication as a Regular Article in Physical Review B