Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure
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; Ashoori, Raymond; ... Show more Show less
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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.
Date issued
2013-05Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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.
Version: Author's final manuscript
ISSN
0036-8075
1095-9203