Excitonic Magneto-Optical Kerr Effect in 2D Transition Metal Dichalcogenides Induced by Spin Proximity

Abstract

In this paper we develop the excitonic theory of 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 two in the case of MoS2 in proximity to a Cobalt thin film.

Accepted for publication in Physical Review B

References in corpus (7)

• 2D materials and van der Waals heterostructures
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Large valley splitting in monolayer WS${}_2$ by proximity coupling to an insulating antiferromagnetic substrate
• Terahertz radiation-induced conductivity, Kerr and Faraday angles, and spin textures in a two-dimensional electron gas with spin-orbit coupling subjected to a high magnetic field and periodic potential

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• A colloquium on the variational method applied to excitons in 2D materials
• Emergent bright excitons with Rashba spin-orbit coupling in atomic monolayers
• Analytical Quantitative Semi-Classical Approach to the LoSurdo-Stark Effect and Ionization in 2D excitons