Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure
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Ashoori_Massive Dirac.pdf
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Author(s)
Yankowitz, M.
LeRoy, Brian J.
Watanabe, K.
Taniguchi, T.
Moon, P.
Koshino, M.
Hunt, Benjamin Matthew
Sanchez, Javier Daniel
Young, Andrea Franchini
Jarillo-Herrero, Pablo
Date Issued
May 2013
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Hunt, B., J. D. Sanchez-Yamagishi, A. F. Young, M. Yankowitz, B. J. LeRoy, K. Watanabe, T. Taniguchi, et al. “Massive Dirac Fermions and Hofstadter Butterfly in a van Der Waals Heterostructure.” Science 340, no. 6139 (June 21, 2013): 1427–1430.
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Author's final manuscript
Abstract
van der Waals heterostructures constitute a new class of artificial materials formed by stacking atomically thin planar crystals. We demonstrated band structure engineering in a van der Waals heterostructure composed of a monolayer graphene flake coupled to a rotationally aligned hexagonal boron nitride substrate. The spatially varying interlayer atomic registry results in both a local breaking of the carbon sublattice symmetry and a long-range moiré superlattice potential in the graphene. In our samples, this interplay between short- and long-wavelength effects resulted in a band structure described by isolated superlattice minibands and an unexpectedly large band gap at charge neutrality. This picture is confirmed by our observation of fractional quantum Hall states at ±5/3 filling and features associated with the Hofstadter butterfly at ultrahigh magnetic fields.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://www.sciencemag.org/content/340/6139/1427
