Heat transport in quantum spin chains: the relevance of integrability

TL;DR

This paper explores heat transport in quantum spin chains and finds that anomalous transport is related to fermionic mapping rather than integrability, broadening understanding of transport phenomena at low temperatures.

Contribution

It demonstrates that anomalous heat transport depends on fermionic mapping, not integrability, providing new insights into quantum spin chain behavior.

Findings

Anomalous heat transport is linked to fermionic mapping.

Integrability does not determine heat transport behavior.

Results suggest wider applicability at low temperatures.

Abstract

We investigate heat transport in various quantum spin chains, using the projector operator technique. We find that anomalous heat transport is linked not to the integrability of the Hamiltonian, but to whether it can be mapped to a model of non-interacting fermions. Our results also suggest how seemingly anomalous transport may occur at low temperatures in a much wider class of models.