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Gate-variable optical transitions in graphene.

Feng Wang1, Yuanbo Zhang, Chuanshan Tian

  • 1Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA. fengwang76@berkeley.edu

Science (New York, N.Y.)
|March 15, 2008
PubMed
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Electrical gating tunes the optical transitions in graphene, revealing its electronic band structure. This tunability in graphene monolayers and bilayers offers new possibilities for infrared optics and optoelectronics.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional materials like graphene exhibit unique electrical properties.
  • Understanding the electronic band structure is crucial for graphene applications.

Purpose of the Study:

  • To investigate the optical transitions in graphene monolayers and bilayers.
  • To explore the effect of electrical gating on these optical transitions.
  • To demonstrate how optical probing can reveal graphene's band structure.

Main Methods:

  • Infrared spectroscopy was employed to study optical transitions.
  • Electrical gating was used to modify these transitions, similar to field-effect transistors.

Main Results:

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  • Graphene exhibits strong interband transitions.
  • Electrical gating significantly modifies these optical transitions.
  • Gate-dependent transitions directly reveal the linear band dispersion of Dirac fermions in monolayer graphene.
  • A van Hove singularity due to interlayer coupling was observed in bilayer graphene.

Conclusions:

  • Gate-tunable interband transitions provide a powerful optical method for probing graphene's electronic band structure.
  • The layer-dependent optical properties and tunability of graphene are promising for infrared optics and optoelectronics.