Resonant side-jump thermal Hall effect of phonons coupled to dynamical defects
CMSA EVENTS: CMSA QUANTUM MATTER IN MATH & PHYSICS SEMINAR
We present computations of the thermal Hall coefficient of phonons scattering off defects with multiple energy levels. Using a microscopic formulation based on the Kubo formula, we find that the leading contribution perturbative in the phonon-defect coupling is of the `side-jump’ type, which is proportional to the phonon lifetime. This contribution is at resonance when the phonon energy equals a defect level spacing. Our results are obtained for different defect models, and include models of an impurity quantum spin in the presence of quasi-static magnetic order with an isotropic Zeeman coupling to the applied field.
This work is based on arxiv: 2201.11681
For information on how to join, please see: https://cmsa.fas.harvard.edu/seminars-and-colloquium/