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Lee M, Wallbank JR, Gallagher P, et al. Ballistic miniband conduction in a graphene superlattice. Science. 2016;353(6307):1526-1529doi: 10.1126/science.aaf1095.
Lee, M., Wallbank, J. R., Gallagher, P., Watanabe, K., Taniguchi, T., Fal'ko, V. I., & Goldhaber-Gordon, D. (2016). Ballistic miniband conduction in a graphene superlattice. Science (New York, N.Y.), 353(6307), 1526-1529. https://doi.org/10.1126/science.aaf1095
Lee, Menyoung, et al. "Ballistic miniband conduction in a graphene superlattice." Science (New York, N.Y.) vol. 353,6307 (2016): 1526-1529. doi: https://doi.org/10.1126/science.aaf1095
Lee M, Wallbank JR, Gallagher P, Watanabe K, Taniguchi T, Fal'ko VI, Goldhaber-Gordon D. Ballistic miniband conduction in a graphene superlattice. Science. 2016 Sep 30;353(6307):1526-1529. doi: 10.1126/science.aaf1095. PMID: 27708100.
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Science. 2016 Sep 30;353(6307):1526-1529. doi: 10.1126/science.aaf1095.

Ballistic miniband conduction in a graphene superlattice.

Science (New York, N.Y.)

Menyoung Lee, John R Wallbank, Patrick Gallagher, Kenji Watanabe, Takashi Taniguchi, Vladimir I Fal'ko, David Goldhaber-Gordon

Affiliations

  1. Department of Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA.
  2. National Graphene Institute, University of Manchester, Manchester M13 9PL, UK.
  3. National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
  4. National Graphene Institute, University of Manchester, Manchester M13 9PL, UK. School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
  5. Department of Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA. [email protected].

PMID: 27708100 DOI: 10.1126/science.aaf1095

Abstract

Rational design of long-period artificial lattices yields effects unavailable in simple solids. The moiré pattern in highly aligned graphene/hexagonal boron nitride (h-BN) heterostructures is a lateral superlattice with high electron mobility and an unusual electronic dispersion whose miniband edges and saddle points can be reached by electrostatic gating. We investigated the dynamics of electrons in moiré minibands by measuring ballistic transport between adjacent local contacts in a magnetic field, known as the transverse electron focusing effect. At low temperatures, we observed caustics of skipping orbits extending over hundreds of superlattice periods, reversals of the cyclotron revolution for successive minibands, and breakdown of cyclotron motion near van Hove singularities. At high temperatures, electron-electron collisions suppress focusing. Probing such miniband conduction properties is a necessity for engineering novel transport behaviors in superlattice devices.

Copyright © 2016, American Association for the Advancement of Science.

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