Henriques, João C.G., Catarina, Gonçalo, Costa, António T., Fernández-Rossier, Joaquín, Peres, Nuno M.R.
Excitonic magneto-optical Kerr effect in two-dimensional transition metal dichalcogenides induced by spin proximity
Physical Review B. 2020, 101: 045408. https://doi.org/10.1103/PhysRevB.101.045408
URI: http://hdl.handle.net/10045/109975
DOI: 10.1103/PhysRevB.101.045408
ISSN: 2469-9950 (Print)
Abstract: 
In this paper, we develop the excitonic theory of the Kerr rotation angle in a two-dimensional (2D) transition metal dichalcogenide at zero magnetic field. The finite Kerr angle is induced by the interplay between spin-orbit splitting and proximity exchange coupling due to the presence of a ferromagnet. We compare the excitonic effect with the single-particle theory approach. We show that the excitonic properties of the 2D material lead to a dramatic change in the frequency dependence of the optical response function. We also find that the excitonic corrections enhance the optical response by a factor of 2 in the case of MoS2 in proximity to a cobalt thin film.
Keywords:Transition metal dichalcogenides, Excitons, Proximity, Magneto-optical Kerr effect, Exchange pin splitting, Optical Conductivity
American Physical Society
info:eu-repo/semantics/article