Drienovsky, Martin and Joachimsmeyer, Jonas and Sandner, Andreas and Liu, Ming-Hao and Taniguchi, Takashi and Watanabe, Kenji and Richter, Klaus and Weiss, Dieter and Eroms, Jonathan (2018) Commensurability Oscillations in One-Dimensional Graphene Superlattices. PHYSICAL REVIEW LETTERS, 121 (2): 026806. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2-DIMENSIONAL ELECTRON-GAS; SUSPENDED GRAPHENE; DIRAC FERMIONS; MAGNETORESISTANCE OSCILLATIONS; BALLISTIC TRANSPORT; BILAYER GRAPHENE; SCATTERING; STATES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Mar 2020 14:23 |
| Last Modified: | 06 Mar 2020 14:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14242 |
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