Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 43: Two-Dimensional Materials IV (joint session DS, HL, TT, organized by HL)
TT 43.3: Talk
Wednesday, March 22, 2017, 10:00–10:15, POT 51
Commensurability oscillations in electrostatically modulated graphene — •Martin Drienovsky1, Jonas Joachimsmeyer1, Takashi Taniguchi3, Kenji Watanabe3, Ming-Hao Liu2, Klaus Richter2, Dieter Weiss1, and Jonathan Eroms1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 2Institut für Theoretische Physik, Universität Regensburg, Germany — 3National Institute for Material Science, Tsukuba, Japan
We report on the first experimental observation of commensurability oscillations (COs) [1] in a 1D periodic graphene superlattice. Employing a locally acting few layer graphene patterned bottom gate (FLG PBG) and a dry van-der-Waals stacking method we prepare high mobility graphene-boron nitride heterostructures, where the ballistic length exceeds several periods of the modulation. The potential landscape can be tuned by the striped FLG PBG and a global back gate in such a way that a small, periodic and unipolar potential perturbation is generated. The magnetoresistance exhibits well pronounced COs at predicted magnetic field positions for electrostatic modulation, both for the electron and hole transport regime. Our measurements confirm strong robustness of the COs in graphene with respect to temperature [2], as they remain visible up to 155 K.
[1] D. Weiss et al., Europhys. Lett. 8, 179 (1989) [2] A. Matulis and F. M. Peeters, Phys. Rev. B 75, 125429 (2007)