Thermal Transport for Probing Quantum Materials

TL;DR

Thermal transport provides unique insights into quantum materials by revealing quasiparticle behavior, topological properties, and superconducting gap structures, complementing electrical transport measurements.

Contribution

This paper highlights the pivotal role of thermal transport in probing quantum materials, emphasizing its ability to detect quasiparticles, topology, and superconducting features.

Findings

Thermal transport detects quasiparticles in insulating quantum spin liquids.

Thermal transport reveals superconducting gap structures.

Anomalous Nernst effect linked to Berry curvature in Weyl semimetals.

Abstract

Thermal transport is less appreciated in probing quantum materials in comparison to electrical transport. This article aims to show the pivotal role that thermal transport may play in understanding quantum materials: the longitudinal thermal transport reflects the itinerant quasiparticles even in an electrical insulating phase, while the transverse thermal transport such as thermal Hall and Nernst effect are tightly linked to nontrivial topology. We discuss three types of examples: quantum spin liquids where thermal transport identifies its existence, superconductors where thermal transport reveals the superconducting gap structure, and topological Weyl semimetals where anomalous Nernst effect is a consequence of nontrivial Berry curvature. We conclude with an outlook of the unique insights thermal transport may offer to probe a much broader category of quantum phenomena.