Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Magnetism – Transport
TT 79.2: Vortrag
Donnerstag, 12. März 2026, 11:45–12:00, HSZ/0103
Extrinsic contribution to bosonic thermal Hall transport — •Léo Mangeolle1,2 and Johannes Knolle1,2,3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München, Germany — 3Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
Bosonic excitations like phonons and magnons dominate the low-temperature transport of magnetic insulators. Similar to electronic Hall responses, the thermal Hall effect (THE) of charge neutral bosons has been proposed as a powerful tool for probing topological properties of their wavefunctions. For example, the intrinsic contribution of the THE of a perfectly clean system is directly governed by the distribution of Berry curvature. However, disorder is inevitably present in any material and its contribution to the THE has remained poorly understood. Here we develop a rigorous kinetic theory of the extrinsic side-jump contribution to the THE of bosons. We show that the extrinsic THE is always relevant for bosonic systems and can be of the same order as the intrinsic one but sensitively depends on the type of local imperfection. We study different types of impurities and show that a THE can even arise as a pure impurity-induced effect in a system with a vanishing intrinsic contribution. We discuss the importance of our results for the correct interpretation of THE measurements and provide a ready-to-use formula for comparison to experimental data.
Keywords: thermal conductivity; kinetic theory; disorder; quantum geometry; anomalous Hall effects