d-density wave state in an external magnetic field

TL;DR

This paper investigates how an external magnetic field affects electrical and thermal conductivities in the d-density wave state, revealing that the Wiedemann-Franz law holds at zero temperature but can be violated at finite temperatures, especially under a magnetic field.

Contribution

It provides a detailed analysis of conductivity behaviors in the DDW state under magnetic fields and impurity effects, highlighting conditions for WF law violation.

Findings

WF law remains valid at T=0

WF law violation increases with magnetic field at finite T

Impurities influence conductivity in the DDW state

Abstract

We present a study of the electrical and thermal conductivities of the $d$-density wave (DDW) state in an external magnetic field $B$ in the low temperature regime and in the presence of impurities. We show that in the zero temperature limit, $T \to 0$, the Wiedemann-Franz (WF) law remains intact. For finite $T$ the WF law violation is possible and it is enhanced by the external field.