Orbital-selective Mott Transitions in a Doped Two-band Hubbard Model

TL;DR

This paper investigates how doping affects orbital-selective Mott transitions in a two-band Hubbard model using advanced quantum Monte Carlo methods, revealing clear transition signatures and contrasting with single-band models.

Contribution

It extends previous half-filled studies to doped cases, providing high-precision insights into orbital-selective Mott transitions in a two-band Hubbard model.

Findings

Orbital-selective Mott transitions are evident at strong interactions with doping.

Distinct behaviors are observed in band-specific properties like fillings and quasiparticle weights.

Results differ from single-band models under similar correlation conditions.

Abstract

We extend previous studies on orbital-selective Mott transitions in the paramagnetic state of the half-filled degenerate two-band Hubbard model to the general doped case, using a high-precision quantum Monte Carlo dynamical mean-field theory solver. For sufficiently strong interactions, orbital-selective Mott transitions as a function of total band filling are clearly visible in the band-specific fillings, quasiparticle weights, double occupancies, and spectra. The results are contrasted with those of single-band models for similar correlation strengths.