ONLINE - PhD Mid-term Seminar Series: Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe2
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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
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Franz Herling, Nanodevices Group
- When
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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
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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).
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Please **REGISTER** for PhD Mid-term Seminar Series on Sep 21, 2020 11:00 AM
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