Dr. Judit Romhanyi (OIST)
"Hall responses in larger spin quantum magnets"
Phenomena related to nontrivial band topology and transverse transports have recently gained enormous interest.
Including spin degrees of freedom, a new branch of Hall responses has been proposed and observed. The concept of
(anomalous/spin) Hall and (anomalous/spin) Nernst effects quickly spread from the electronic systems to magnetic
excitations, leading to magnon-mediated Hall responses.
Here we consider magnetic insulators with larger spin and investigate the topology of the multipolar bands.
We discuss the spin-Hall and thermal Hall effects arising for topologically nontrivial magnon modes.
Furthermore, we address the multipole character of the nontrivial bands, and their possible experimental
detection related to these additional degrees of freedom.