Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 50: Optics and Light-Matter Interaction with Excitons in 2D Materials
(Joint Session HL, DS, O, and TT, organized by DS)

DS 50.3: Talk

Friday, March 24, 2017, 11:45–12:00, CHE 89

Spin-flip transitions induced by time-dependent electric fields in tuned Transition Metal Dichalcogenides magnetic thin films. — •Omar Messaoudi^1,2, Julen Ibañez-Azpiroz², Hamid Bouzar¹, and Samir Lounis² — ¹Université Mouloud Mammeri de Tizi Ouzou, Tizi Ouzou, Algeria — ²Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

We study from first principles the relativistic electron structure of Transition Metal Dichalcogenides such as MoS₂ and WS₂ on top of which Iron is deposited as a monolayer or as a single impurity. The resulting systems turn out to be magnetic and, in particular, the states near the Fermi level show a non-negligible noncollinear spin-polarization due to the effect of spin-orbit coupling. In these noncollinear states, we analyze the excitations induced by a time-dependent electric field employing a formalism based on the maximally localized Wannier functions [1]. Finally, we analyze the absorption spectrum of circularly polarized light and discuss the possibility of observing a dichroic signal.

[1] J. Ibañez-Azpiroz et. al, Phys. Rev. Lett. 109, 156401 (2012)

Funding provided by the ERC-consolidator grant Dynasore and the Algerian Ministry of Higher Education and Scientific Research.