Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure
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 nit...
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| Format: | Article |
| Language: | en_US |
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American Association for the Advancement of Science (AAAS)
2014
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| Online Access: | http://hdl.handle.net/1721.1/85880 https://orcid.org/0000-0001-9703-6525 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0001-5031-1673 |
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| author | 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 |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics 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 |
| author_sort | Yankowitz, M. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T16:27:05Z |
| format | Article |
| id | mit-1721.1/85880 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:27:05Z |
| publishDate | 2014 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/858802022-10-02T08:00:43Z Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure 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 Massachusetts Institute of Technology. Department of Physics Hunt, Benjamin Matthew Sanchez, Javier Daniel Young, Andrea Franchini Jarillo-Herrero, Pablo Ashoori, Raymond 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. United States. Dept. of Energy. Office of Basic Energy Sciences (Contract FG02-08ER46514) Gordon and Betty Moore Foundation (Grant GBMF2931) United States. Dept. of Energy. Office of Basic Energy Sciences (Division of Materials Science and Engineering Grant DE-SC0001819) National Science Foundation (U.S.) (Career Award DMR-0845287) United States. Office of Naval Research. Multidisciplinary University Research Initiative. Graphene Approaches to Terahertz Electronics 2014-03-21T17:16:56Z 2014-03-21T17:16:56Z 2013-05 2013-03 Article http://purl.org/eprint/type/JournalArticle 0036-8075 1095-9203 http://hdl.handle.net/1721.1/85880 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. https://orcid.org/0000-0001-9703-6525 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0001-5031-1673 en_US https://www.sciencemag.org/content/340/6139/1427 Science Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Association for the Advancement of Science (AAAS) arXiv |
| spellingShingle | 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 Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title | Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title_full | Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title_fullStr | Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title_full_unstemmed | Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title_short | Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure |
| title_sort | massive dirac fermions and hofstadter butterfly in a van der waals heterostructure |
| url | http://hdl.handle.net/1721.1/85880 https://orcid.org/0000-0001-9703-6525 https://orcid.org/0000-0001-8217-8213 https://orcid.org/0000-0001-5031-1673 |
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