Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.47: Poster
Tuesday, March 13, 2018, 09:30–13:00, Poster A
Spin to charge current conversion in transition metal dichalcogenide — •Lukáš Nádvorník1, Lukas Braun2, Bin Cui3, Tom Seifert1, Oliver Gückstock2, Martin Wolf2, Stuart Parkin3, and Tobias Kampfrath1,2 — 1Freie Universität, Berlin, Germany — 2Fritz-Haber-Institut der MPG, Berlin, Germany — 3Max Planck Institute of Microstructure Physics, Halle, Germany
In the last decade, transition metal dichalcogenides (TMDCs) have attracted considerable attention for their unique mechanical, electronic and spin properties [1]. By sharing a similar honeycomb crystal structure with graphene, they allow for optical generation of the valley polarization. Unlike graphene, they also exhibit a large spin-orbit coupling. This feature and the recently observed valley Hall effect [2] makes TMDCs ideal candidates for spintronic and valleytronic applications.
In this contribution, we report on the observation of an ultrafast injection of in-plane-polarized electron spins and the inverse spin Hall effect (iSHE) in metallic TMDC NbSe2 at terahertz (THz) frequencies. By excitation of an adjacent ferromagnetic layer by an ultrashort optical pulse, we launch a spin-polarized current into the TMDC where it is converted to a charge current via the iSHE. This ultrashort charge current burst acts as a source of an ultrashort THz electromagnetic pulse [3] whose measurement allows us to estimate the efficiency and dynamics of the spin-to-charge-current conversion.
[1] S. Manzeli et al., Nature Reviews 2, 17033 (2017). [2] K.F. Mak et al., Science 344, 1489 (2014). [3] T. Kampfrath et al., Nature Nanotech. 8, 256 (2013).