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The evolution of electronic structure in few-layer graphene revealed by optical spectroscopy

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Mak, Kin Fai, Sfeir, Matthew Y., Misewich, James A., Heinz, Tony F.·2010·Proceedings of the National Academy of Sciences

Abstract

The massless Dirac spectrum of electrons in single-layer graphene has been thoroughly studied both theoretically and experimentally. Although a subject of considerable theoretical interest, experimental investigations of the richer electronic structure of few-layer graphene (FLG) have been limited. Here we examine FLG graphene crystals with Bernal stacking of layer thicknesses N = 1,2,3,…8 prepared using the mechanical exfoliation technique. For each layer thickness N , infrared conductivity measurements over the spectral range of 0.2–1.0 eV have been performed and reveal a distinctive band structure, with different conductivity peaks present below 0.5 eV and a relatively flat spectrum at higher photon energies. The principal transitions exhibit a systematic energy-scaling behavior with N . These observations are explained within a unified zone-folding scheme that generates the electronic states for all FLG materials from that of the bulk 3D graphite crystal through imposition of appropriate boundary conditions. Using the Kubo formula, we find that the complete infrared conductivity spectra for the different FLG crystals can be reproduced reasonably well within the framework a tight-binding model.

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Metadata

Authors
Mak, K. F., Sfeir, M. Y., Misewich, J. A., & Heinz, T. F.
Venue
Proceedings of the National Academy of Sciences
Published
2010-08-09
Volume
107
Issue
34
Pages
14999-15004
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1994637197
Cited by
235
References
6
FWCI
8.96
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: The evolution of electronic structure in few-layer graphene revealed by optical spectroscopy. https://app.cochat.ai/papers/10.1073/pnas.1004595107
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Mak, K. F., Sfeir, M. Y., Misewich, J. A., & Heinz, T. F. (2010). The evolution of electronic structure in few-layer graphene revealed by optical spectroscopy. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1004595107

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