Spin and magnetothermal transport in the S = 1/2 XXZ chain

TL;DR

This paper investigates how temperature and magnetic fields influence spin and heat transport in an integrable quantum spin chain, providing insights relevant to experimental observations in one-dimensional magnetic materials.

Contribution

It extends previous Bethe ansatz analysis to include magnetothermal effects and critically examines low-temperature and weak-field behaviors in the S=1/2 XXZ chain.

Findings

Magnetothermal corrections significantly affect thermal conductivity near the critical field.

Low temperature behavior shows distinct signatures in spin transport.

Results align with recent experimental data on 1D quantum magnets.

Abstract

We present a temperature and magnetic field dependence study of spin transport and magnetothermal corrections to the thermal conductivity in the spin S = 1/2 integrable easy-plane regime Heisenberg chain, extending an earlier analysis based on the Bethe ansatz method. We critically discuss the low temperature, weak magnetic field behavior, the effect of magnetothermal corrections in the vicinity of the critical field and their role in recent thermal conductivity experiments in 1D quantum magnets.