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HL: Fachverband Halbleiterphysik
HL 20: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)
HL 20.11: Vortrag
Montag, 16. März 2020, 18:15–18:30, POT 81
On-demand exchange and spin-orbit in bilayer graphene sandwiched between TMDC and ferromagnet — •Klaus Zollner1, Martin Gmitra2, and Jaroslav Fabian1 — 1Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2Institute of Physics, P. J. Šafárik University in Košice, 04001 Košice, Slovakia
Van der Waals heterostructures offer great potential for future device applications. Bilayer graphene on a transition-metal dichalcogenide (TMDC) experiences strong proximity spin-orbit coupling (SOC) [1], and record spin lifetime anisotropies are achievable [2]. Moreover, one can turn ON and OFF the SOC in bilayer graphene with a gate voltage [3], and realize a spin-orbit valve [1]. Similarly, one can have on-demand proximity exchange in a bilayer graphene/ferromagnetic-insulator heterostructure [4],realizing an exchange valve. The logical next step is to combine both proximity effects, exchange and SOC in bilayer graphene sandwiched between TMDC and ferromagnet-insulator. In this talk, we will present our results of a time-reversal field effect valve in doubly proximitized bilayer graphene.
This work was supported by DFG SPP 1666, SFB 1277, the EU Horizon 2020 research and innovation program under Grant No. 785219, and by the reintegration scheme MSVVaS SR 90/CVTISR/2018 and VVGS-2019-1227.
[1] Gmitra et al., Phys. Rev. Lett. 119, 146401 (2017). [2] Omar et al., Phys. Rev. B 100, 155415 (2019). [3] Island et al., Nature 571, 85 (2019). [4] Zollner et al., N. J. Phys. 20, 073007 (2018).