Quantum phase transition in the two-band Hubbard model

TL;DR

This paper investigates a novel nonmagnetic quantum phase transition in a two-band Hubbard model, revealing critical behavior in strongly correlated materials relevant to transition metal oxides.

Contribution

It introduces the discovery of a nonmagnetic quantum phase transition within the orbital-selective Mott phase using dynamical mean field theory and numerical renormalization group methods.

Findings

Identification of a nonmagnetic quantum phase transition at zero temperature.

Relevance of the transition to transition metal oxides.

Insights into the interplay of itinerant and localized electronic states.

Abstract

The interaction between itinerant and Mott localized electronic states in strongly correlated materials is studied within dynamical mean field theory in combination with the numerical renormalization group method. A novel nonmagnetic zero temperature quantum phase transition is found in the bad-metallic orbital-selective Mott phase of the two-band Hubbard model, for values of the Hund's exchange which are relevant to typical transition metal oxides.