Imperfect nesting and transport properties in unconventional density waves

TL;DR

This paper studies how imperfect nesting affects transport properties in unconventional density waves, revealing effects on conductivity and threshold electric fields, with implications for organic conductors.

Contribution

It introduces a detailed analysis of imperfect nesting effects on transport in unconventional density waves, aligning theoretical predictions with experimental data.

Findings

Small dip in frequency-dependent conductivity at T=0

Threshold electric field varies with imperfect nesting parameter

Model explains low-temperature transport in alpha-(BEDT-TTF)_2KHg(SCN)_4

Abstract

We consider the effect of imperfect nesting in quasi-one dimensional unconventional density waves. The phase diagram is very close to those in a conventional DW. The linear and non-linear aspects of the electric conductivity are discussed. At T=0 the frequency dependent electric conductivity develops a small dip at low frequencies. The threshold electric field depends strongly on the imperfect nesting parameter, allowing us to describe the measured threshold electric field in the low temperature phase of the quasi-two dimensional organic conductor, alpha-(BEDT-TTF)_2KHg(SCN)_4 very well.