Optical and transport properties in doped two-leg ladder antiferromagnet

TL;DR

This paper investigates the optical and transport behaviors of doped two-leg ladder antiferromagnets using the t-J model, revealing holon scattering as a key factor and explaining experimental observations of conductivity and resistivity crossover.

Contribution

It applies the fermion-spin theory within the t-J model to analyze optical and transport properties, highlighting the role of holon scattering in doped ladder antiferromagnets.

Findings

Optical conductivity has a finite energy low energy peak.

Resistivity shows a crossover from metallic to insulating behavior.

Results align with experimental data.

Abstract

Within the t-J model, the optical and transport properties of the doped two-leg ladder antiferromagnet are studied based on the fermion-spin theory. It is shown that the optical and transport properties of the doped two-leg ladder antiferromagnet are mainly governed by the holon scattering. The low energy peak in the optical conductivity is located at a finite energy, while the resistivity exhibits a crossover from the high temperature metallic-like behavior to the low temperature insulating-like behavior, which are consistent with the experiments.