SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Topology: Other Topics
TT 64.7: Vortrag
Freitag, 31. März 2023, 11:00–11:15, HSZ 201
Direct optical probe of magnon topology in two-dimensional quantum magnets — •Michael Sentef1, Emil Boström1, Tahereh Parvini2, James McIver1, Angel Rubio1, and Silvia Viola Kusminskiy3 — 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg — 2University of Greifswald — 3RWTH Aachen
Controlling edge states of topological magnon insulators is a promising route to stable spintronics devices. However, to experimentally ascertain the topology of magnon bands is a challenging task. Here we derive a fundamental relation between the light-matter coupling and the quantum geometry of magnon states. This allows to establish the two-magnon Raman circular dichroism as an optical probe of magnon topology in honeycomb magnets, in particular of the Chern number and the topological gap. Our results pave the way for interfacing light and topological magnons in functional quantum devices.
arXiv:2207.04745