Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures

Zhi-Guo Chen, Zhiwen Shi, Wei Yang, Xiaobo Lu, You Lai, Hugen Yan, Feng Wang (), Guangyu Zhang () and Zhiqiang Li ()
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Zhi-Guo Chen: National High Magnetic Field Laboratory
Zhiwen Shi: University of California at Berkeley
Wei Yang: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Xiaobo Lu: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
You Lai: National High Magnetic Field Laboratory
Hugen Yan: IBM Thomas J. Watson Research Center, Yorktown Heights
Feng Wang: University of California at Berkeley
Guangyu Zhang: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Zhiqiang Li: National High Magnetic Field Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract 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 ~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.

Date: 2014
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DOI: 10.1038/ncomms5461

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