Special seminar: Are quantum oscillations observable in phonon thermal transport?

Wednesday 8 May 2024, 2 pm

The ability of solids to transport entropy or heat is one of the most fundamental properties of matter. In most metals electrons are believed to transport heat and charge with similar efficiency leading to a proportionality between electrical and thermal conductivity (Widemann-Franz law). However recent results on topological quantum systems have challenged our intuitive understanding of thermal transport suggesting that it could be a sensitive tool for detecting effects originating from topologically non-trivial states of matter. In this talk I will discuss an apparent violation of the WF law seen in magnetotransport of the Dirac and Weyl semimetals ZrTe$_5$ and NbP. I will demonstrate using results from ultrasonic attenuation and thermal transport measurement how the electronic subsystem can imprint its properties into the lattice, giving rise to dramatic, non trivial effects such as appearance of giant quantum oscillations in thermal conductivity of phonons. The presented results will highlight the importance of detailed understanding the e-p coupling in studies of thermal properties of topological matter.

dr. Stanislav Galeski - Germany
Wednesday 8 May 2024, 2 pm
Dr. Stanislaw Galeski , University of Bonn, Germany
Huygens building, HG00.514