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Title: Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy

Abstract

We present a compelling evidence for the opening of a bandgap in exfoliated bottom-gated bilayer graphene by fitting the gate-voltage-modulated infrared reflectivity spectra in a large range of doping levels with a tight-binding model and the Kubo formula. A close quantitative agreement between the experimental and calculated spectra is achieved, allowing us to determine self-consistently the full set of Slonczewski-Weiss-McClure tight-binding parameters together with the gate-voltage-dependent bandgap. The doping dependence of the bandgap shows a good agreement with the existing calculations that take the effects of self-screening into account. We also identify certain mismatches between the tight-binding model and the data, which can be related to electron-electron and electron-phonon interactions.

Authors:
; ; ; ;  [1]
  1. Departement de Physique de la Matiere Condensee, Universite de Geneve, CH-1211 Geneve 4 (Switzerland)
Publication Date:
OSTI Identifier:
21287095
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 16; Other Information: DOI: 10.1103/PhysRevB.80.165406; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; CARBON; ELECTRIC POTENTIAL; ELECTRON-ELECTRON INTERACTIONS; ELECTRON-PHONON COUPLING; ELECTRONS; ENERGY GAP; INFRARED SPECTRA; KUBO FORMULA; LAYERS; NANOSTRUCTURES; REFLECTIVITY; THIN FILMS

Citation Formats

Kuzmenko, A B, Crassee, I, Marel, D van der, Blake, P, Novoselov, K S, and Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL. Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy. United States: N. p., 2009. Web. doi:10.1103/PHYSREVB.80.165406.
Kuzmenko, A B, Crassee, I, Marel, D van der, Blake, P, Novoselov, K S, & Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL. Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy. United States. doi:10.1103/PHYSREVB.80.165406.
Kuzmenko, A B, Crassee, I, Marel, D van der, Blake, P, Novoselov, K S, and Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL. Thu . "Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy". United States. doi:10.1103/PHYSREVB.80.165406.
@article{osti_21287095,
title = {Determination of the gate-tunable band gap and tight-binding parameters in bilayer graphene using infrared spectroscopy},
author = {Kuzmenko, A B and Crassee, I and Marel, D van der and Blake, P and Novoselov, K S and Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL},
abstractNote = {We present a compelling evidence for the opening of a bandgap in exfoliated bottom-gated bilayer graphene by fitting the gate-voltage-modulated infrared reflectivity spectra in a large range of doping levels with a tight-binding model and the Kubo formula. A close quantitative agreement between the experimental and calculated spectra is achieved, allowing us to determine self-consistently the full set of Slonczewski-Weiss-McClure tight-binding parameters together with the gate-voltage-dependent bandgap. The doping dependence of the bandgap shows a good agreement with the existing calculations that take the effects of self-screening into account. We also identify certain mismatches between the tight-binding model and the data, which can be related to electron-electron and electron-phonon interactions.},
doi = {10.1103/PHYSREVB.80.165406},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 16,
volume = 80,
place = {United States},
year = {2009},
month = {10}
}