Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.037403
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Funding
- UCSD
- U. S. DOE [DEFG0300ER45799]
- Research at Columbia University [DE-AIO2-04ER46133, DE-FG02-05ER46215]
- NSF [DMR-0352738, CHE-0117752]
- NYSTAR
- Keck Foundation
- Office of Science, Office of Basic Energy Sciences, of the U. S. Department of Energy [DE-AC0205CH11231]
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We report on infrared spectroscopy of bilayer graphene integrated in gated structures. We observe a significant asymmetry in the optical conductivity upon electrostatic doping of electrons and holes. We show that this finding arises from a marked asymmetry between the valence and conduction bands, which is mainly due to the inequivalence of the two sublattices within the graphene layer and the next-nearest-neighbor interlayer coupling. From the conductivity data, the energy difference of the two sublattices and the interlayer coupling energy are directly determined.
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