ONLINE - PhD Mid-term Seminar Series: Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe2

CIC nanoGUNE Seminars

Speaker

Franz Herling, Nanodevices Group

When

2020/09/21
13:00

Place

nanoGUNE online Webinar

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**** **Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe2** Franz Herling Nanodevices Group, CIC nanoGUNE **** The proximity effect in two-dimensional materials opens ways to achieve important functions for future spintronic devices. In van der Waals heterostructures (vdWHs), transition metal dichalcogenides (TMD) can be used to enhance the spin-orbit coupling of graphene leading to highly efficient spin-to-charge conversion (SCC) by spin Hall effect (SHE) that is predicted to be controllable by a gate voltage. Here, we report for the first time the observation of the SHE in graphene proximitized with WSe2 in a vdWHs. These kind of vdWHs are a promising platform to study a variety of spin-dependent phenomena [1,2]. By Hanle precession measurements, we quantify the spin transport and SCC parameters from 10 K up to room temperature. Exceptional for graphene/TMD devices, the sole mechanism is the SHE for all measurements and no Rashba-Edelstein effect is observable. Importantly, we are able to amplify and turn off the SCC by applying a back-gate voltage, demonstrating the long- awaited milestone of an electrically-tunable SHE. The amplified SCC shows a high efficiency, measured with an unprecedented SCC length of up to 41 nm (with a lower limit of 20 nm). **References** [1] W. Yan et al., Nat. Commun. 7, 13372 (2016). [2] C. K. Safeer et al., Nano Lett. 19, 1074–1082 (2019). \---------- Please **REGISTER** for PhD Mid-term Seminar Series on Sep 21, 2020 11:00 AM CEST at: https://attendee.gotowebinar.com/register/6831653181103747084 After registering, you will receive a confirmation email containing information about joining the webinar. Thank you very much for your participation!