期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 4, 页码 3142-3146出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2106988
关键词
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资金
- NJUST [2011ZDJH02, AB41374, AE88069]
- National Natural Science Foundation of China [10974096, 11174150, 91021004, 20933006]
- National Key Basic Research Program [2011CB921404]
- USTC-HPC
- Shanghai Super-computer Center
The electronic properties of a graphene-boron nitride (G/BN) bilayer have been carefully investigated by first-principles calculations. We find that the energy gap of graphene is tunable from 0 to 0.55 eV and sensitive to the stacking order and interlayer distances of the G/BN bilayer. By electronic structure analysis and tight-binding simulations, we conclude that the charge redistribution within graphene and charge transfer between graphene and BN layers determine the energy gap of graphene, through modification of the on-site energy difference of carbon p orbitals at two sublattices. On the basis of the revealed mechanism, we also predict: how to engineer the band gap of graphene.
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