Dresden 2017 – wissenschaftliches Programm
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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: Vortrag
Freitag, 24. März 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 Messaoudi1,2, 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.