The Mott transition in V_2 O_3 and Ni Se_x S_{2-x}: insights from dynamical mean field theory

TL;DR

This paper uses dynamical mean field theory to analyze the pressure-driven Mott transition in V_2 O_3 and Ni Se_x S_{2-x}, highlighting universal spectral weight transfer as a key mechanism and comparing theoretical and experimental insights.

Contribution

It isolates universal properties of the Mott transition in transition metal oxides and compares theoretical predictions with experimental results to deepen understanding of the transition mechanism.

Findings

Spectral weight transfer from low to high energies is a universal feature.

Theory and experiment show remarkable agreement on the transition mechanism.

Differences depend on detailed chemistry, but universal behavior persists.

Abstract

We discuss some aspects of the pressure (or interaction) driven Mott transition, in three dimensional transition metal oxides by means of dynami cal mean field theory. We isolate the universal properties of the transition from the aspects which depend more on the detailed chemistry of the compounds. In this light we can understand the main differences and the remarkable similarities between these systems. Both theory and experiment converge on the transfer of spectral weight from low energies to high energies as the universal mechanism underlying the Mott transition, and we comment on the possible relevance of these ideas to other metal to non metal transitions.