Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Focus Session: Spin-Charge Interconversion (joint session MA/HL)

HL 13.3: Hauptvortrag

Montag, 16. März 2020, 16:00–16:30, HSZ 04

Spin-charge interconversion in graphene/TMD Van der Waals heterostructures — •Bart Van Wees — Zernike Institute for Advanced materials, University of Groningen, The Netherlands

I will give an introduction into spin transport, spin relaxation and spin-charge conversion in Van der Waals heterostructures made of (single) layer graphene and (single layer) transition metal dichalcogenides (TMDs). Due to their proximity, the strong anisotropic spin orbit interaction in the TMD results in anisotropic, valley-Zeeman and Rashba type spin orbits field in the graphene . As a result the spin relaxation in graphene becomes strongly anisotropic, with out-of-plane oriented spins having a factor 10 or more longer spin life times than in-plane oriented spins [1,2]. The proximity induced spin orbit interaction also gives the possibility of gate tuneable spin change interconversion mechanisms such as spin Hall effect (and its inverse) and Rashba Edelstein effect (and its inverse). I will explain how these effects are observed experimentally [3,4,5], and how they can be optimized for future 2D spintronics applications.

1] T.S. Ghiasi et al., Nano Lett. 17, 7528-7532 (2017)

2] L.Benitez et al., Nature Physics 14, pages303-308(2018)

3] C.K. Safeer et al., Nano Lett. 19, 2, 1074-1082 (2019)

4] T.S. Ghiasi et al., Nano Lett. 19,9, 5959-5966 (2019)

5] L. A. Benítez et al, https://arxiv.org/abs/1908.07868