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Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 34: Two-dimensional materials III (joined session with TT)

HL 34.8: Vortrag

Dienstag, 21. März 2017, 12:00–12:15, POT 51

Transport measurements in graphene-WSe2 heterostructures — •Tobias Völkl1, Tobias Rockinger1, Martin Drienovsky1, Kenji Watanabe2, Takashi Taniguchi2, Dieter Weiss1, and Jonathan Eroms11Universität Regensburg, Germany — 2National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

Bringing graphene into proximity to WSe2 was proposed as a way to induce a high spin orbit coupling strength in graphene, while maintaining the high intrinsic mobility of graphene. We therefore investigated the transport properties of graphene-WSe2 heterostructures.

Placing graphene onto a WSe2-flake resulted in mobilities around 10000 cm2/Vs of graphene. Further a weak antilocalization behavior was observed, which indicates a high spin orbit coupling strength induced by the WSe2.

Higher mobilities around 100000 cm2/Vs were achieved by encapsulation of graphene between WSe2 and hBN. In these samples no weak antilocalization behavior could be observed. We attribute this to a transition from diffusive to the quasiballistic regime. Also a feature dependent on the sample width arises in the low magnetic field range. We attribute this to a magneto size effect which further indicates quasiballistic behavior.

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