Hybridisation in two-band Hubbard models with different bandwidths

TL;DR

This paper explores how local hybridisation affects the orbital selective Mott transition in two-band Hubbard models with different bandwidths using Gutzwiller variational theory.

Contribution

It introduces the impact of finite local hybridisation on the metal-insulator transition in two-band Hubbard models, a novel aspect not extensively studied before.

Findings

Hybridisation influences the critical interaction strength for the transition.

Finite hybridisation can induce or suppress the orbital selective Mott phase.

Results provide insights into tuning electronic phases via hybridisation.

Abstract

We investigate the orbital selective Mott transition in two-band Hubbard models by means of the Gutzwiller variational theory. In particular, we study the influence of a finite local hybridisation between electrons in different orbitals on the metal-insulator transition.