Massive dirac fermions and hofstadter butterfly in a van der Waals heterostructure

B. Hunt, J. D. Sanchez-Yamagishi, A. F. Young, M. Yankowitz, B. J. LeRoy, K. Watanabe, T. Taniguchi, P. Moon, M. Koshino, P. Jarillo-Herrero, R. C. Ashoori

Research output: Contribution to journalArticle

825 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1427-1430
Number of pages4
JournalScience
Volume340
Issue number6139
DOIs
StatePublished - Jan 1 2013

ASJC Scopus subject areas

  • General

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    Hunt, B., Sanchez-Yamagishi, J. D., Young, A. F., Yankowitz, M., LeRoy, B. J., Watanabe, K., Taniguchi, T., Moon, P., Koshino, M., Jarillo-Herrero, P., & Ashoori, R. C. (2013). Massive dirac fermions and hofstadter butterfly in a van der Waals heterostructure. Science, 340(6139), 1427-1430. https://doi.org/10.1126/science.1237240