期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5461
关键词
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资金
- User Collaboration Grants Programme at the National High Magnetic Field Laboratory
- Office of Basic Energy Science, Department of Energy [DE-SC0003949, DE-AC02-05CH11231]
- National Basic Research Program of China (973 Program) [2013CB934500]
- National Science Foundation of China (NSFC) [61325021, 91223204]
- Chinese Academy of Sciences
- National Science Foundation Cooperative Agreement [DMR-1157490]
- State of Florida
- US Department of Energy
Van der Waals heterostructures formed by assembling different two-dimensional atomic crystals into stacks can lead to many new phenomena and device functionalities. In particular, graphene/boron-nitride heterostructures have emerged as a very promising system for band engineering of graphene. However, the intrinsic value and origin of the bandgap in such heterostructures remain unresolved. Here we report the observation of an intrinsic bandgap in epitaxial graphene/boron-nitride heterostructures with zero crystallographic alignment angle. Magneto-optical spectroscopy provides a direct probe of the Landau level transitions in this system and reveals a bandgap of similar to 38 meV (440 K). Moreover, the Landau level transitions are characterized by effective Fermi velocities with a critical dependence on specific transitions and magnetic field. These findings highlight the important role of many-body interactions in determining the fundamental properties of graphene heterostructures.
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