Band Structure Asymmetry of Bilayer Graphene Revealed by Infrared Spectroscopy

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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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Li, Z.Q.; Henriksen, E.A.; Jiang, Z.; Hao, Zhao; Martin, Michael C.; Kim, P. et al. December 10, 2008.

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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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  • Journal Name: Physical Review Letters; Journal Volume: 102; Journal Issue: 03; Related Information: Journal Publication Date: 23 January 2009

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  • Report No.: LBNL-1523E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 948501
  • Archival Resource Key: ark:/67531/metadc902259

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  • December 10, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Jan. 4, 2017, 3:31 p.m.

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Li, Z.Q.; Henriksen, E.A.; Jiang, Z.; Hao, Zhao; Martin, Michael C.; Kim, P. et al. Band Structure Asymmetry of Bilayer Graphene Revealed by Infrared Spectroscopy, article, December 10, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc902259/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.