Intermediate Phase in Interacting Dirac Fermions with Staggered Potential

Abstract

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 band insulator metallic, and at a larger interaction, drive the metal to Mott insulator. We also show that the Mott insulating phase is antiferromagnetic. A complete phase diagram is achieved by studying the phase transitions at large staggered potential and interaction strengths, which shows that the intermediate state is robust and occupies a large part of the phase diagram and that it should be more feasible to be detected experimentally.

arXiv comment8 pages and 9 figures, accepted for publication in Physical Review B

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• Learning phase transitions from regression uncertainty: A new regression-based machine learning approach for automated detection of phases of matter
• Metal-insulator transition in the disordered Hubbard model of the Lieb lattice
• Correlation Effects in a Simplified Bilayer Two-Orbital Hubbard Model at Half Filling
• Breathing-Driven Metal-Insulator Transition in Correlated Kagome Systems
• Magnetic phase transition in disordered interacting Dirac fermion systems via the Zeeman field
• Dynamical Cluster Approximation Study of Electron Localization in the Extended Hubbard Model