Commensurability Oscillations in One-Dimensional Graphene Superlattices

Martin Drienovsky, Jonas Joachimsmeyer, Andreas Sandner, Ming Hao Liu, Takashi Taniguchi, Kenji Watanabe, Klaus Richter, Dieter Weiss, Jonathan Eroms

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14 Citations (Scopus)

Abstract

We report the experimental observation of commensurability oscillations (COs) in 1D graphene superlattices. The widely tunable periodic potential modulation in hBN-encapsulated graphene is generated via the interplay of nanopatterned few-layer graphene acting as a local bottom gate and a global Si back gate. The longitudinal magnetoresistance shows pronounced COs when the sample is tuned into the unipolar transport regime. We observe up to six CO minima, providing evidence for a long mean free path despite the potential modulation. Comparison to existing theories shows that small-angle scattering is dominant in hBN/graphene/hBN heterostructures. We observe robust COs persisting to temperatures exceeding T=150 K. At high temperatures, we find deviations from the predicted T dependence, which we ascribe to electron-electron scattering.

Original languageEnglish
Article number026806
JournalPhysical review letters
Volume121
Issue number2
DOIs
Publication statusPublished - 2018 Jul 11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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