Spectral properties of Luther-Emery systems

TL;DR

This paper analyzes the spectral function of the Luther-Emery model, revealing interaction-dependent singularities and maxima, with applications to photoemission experiments and one-dimensional Mott insulators.

Contribution

It provides a detailed calculation of the spectral function for the Luther-Emery model, highlighting the effects of gapped spin and gapless charge degrees of freedom.

Findings

Identifies a true singularity with interaction-dependent exponents

Finds a finite maximum depending on the spin gap

Applies results to photoemission experiments and Mott insulators

Abstract

We calculate the spectral function of the Luther-Emery model which describes one-dimensional fermions with gapless charge and gapped spin degrees of freedom. We find a true singularity with interaction dependent exponents on the gapped spin dispersion and a finite maximum depending on the magnitude of the spin gap, on a shifted charge dispersion. We apply these results to photoemission experiments on charge density wave systems and discuss the spectral properties of a one-dimensional Mott insulator.