ESPCI web site
April 3 at 2:00 pm (Paris time)
Room Charpak, entrance building, ground floor
Magneto-optical spectroscopy on van-der-Waals antiferromagnets and topological semimetals
Magneto-optical spectroscopy focuses on the interaction between light and matter,with the magnetic field acting as a continuously adjustable external parameter. The magneto-optic response offers valuable information into the intrinsic properties of systems in their unperturbed states. As a historical example, Landau-level spectroscopy has provided crucial insights into the electronic band structure of semiconductors and semimetals [1]. I will illustrate this point with my recent study on the low-energy excitations of TlBiSSe, a textbook Dirac semimetal. Following this, I will highlight the important role that magneto-optic plays in the ongoing research of van der Waals magnets. Specifically, I will discuss the detection of a novel type of collective excitation, called longitudinal magnons in FePSe3 and FePS3 followed by the study of the magnetic alloy Fe1−xNixPS3 in which magneto-optics allows us to track precisely the evolution of the magnetic properties with respect to the alloy composition.
[1] G. Landwehr and E. I. Rashba. Landau Level Spectroscopy. ISSN. Elsevier Science, 2012.
