Regensburg 2019 – wissenschaftliches Programm

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SYIS: Symposium Interactions and Spin in 2D Heterostructures

SYIS 1: Interactions and Spins in 2D Heterostructures

SYIS 1.4: Hauptvortrag

Donnerstag, 4. April 2019, 16:45–17:15, H1

Spin transport in Van der Waals materials and heterostructures — •Bart Van Wees — Nijenborgh 4.13 9747 AG Groningen

I will give an introduction into spin transport and spin dynamics in Van der Waals structures of (bi) layers of graphene and transition metal dichalcogenides (TMDs). In these systems the specific valley dependent spin structure of the TMD layer can be imprinted on the electron spins in the graphene by spin orbit proximity effect. As a result the spin relaxation times become anisotropic for in-plane and out-of-plane spins [1,2]. This can be studied by (nonlocal) spin transport techniques and spin precession experiments, showing modified anomalous Hanle precession curves. Recently we also observed manifestations of the Rashba Edelstein effect,as well as the spin Hall effect, resulting in in-plane and out-of-plane spin accumulations being generated by a charge current through the Van der Waals heterostructures [3]. I will discuss the relevance of these experiments for charge-spin and charge-spin-photon conversion devices. [1] T.S. Ghiasi et al., Nano Lett. 17, 7528 (2017) [2] J.C. Leutenantsmeyer at al., Phys. Rev. Lett. 121, 127702 (2018) [3] T.S. Ghiasi et al., in preparation