Electron spectra close to a metal-to-insulator transition

TL;DR

This study uses high-resolution numerical methods within dynamic mean-field theory to analyze electron spectra near the metal-insulator transition, revealing a smooth transition at zero temperature and unexpected sharp peaks indicating complex interactions.

Contribution

It provides the first all-numerical confirmation of a smooth zero-temperature transition and uncovers sharp peaks at Hubbard band edges in the metallic regime.

Findings

Confirmed smooth transition at zero temperature

Verified separation of energy scales

Discovered sharp peaks at Hubbard band edges

Abstract

A high-resolution investigation of the electron spectra close to the metal-to-insulator transition in dynamic mean-field theory is presented. An all-numerical, consistent confirmation of a smooth transition at zero temperature is provided. In particular, the separation of energy scales is verified. Unexpectedly, sharp peaks at the inner Hubbard band edges occur in the metallic regime. They are signatures of the important interaction between single-particle excitations and collective modes.