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Related Concept Videos

Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Gate-Dependent Electronic Raman Scattering in Graphene.

E Riccardi1, M-A Méasson1, M Cazayous1

  • 1Laboratoire Matériaux et Phénoménes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, Bâtiment Condorcet, 75205 Paris Cedex 13, France.

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|February 27, 2016
PubMed
Summary
This summary is machine-generated.

Researchers directly observed electronic Raman scattering in graphene, confirming theoretical models of Dirac fermion excitations. This breakthrough enables new Raman spectroscopy studies of 2D materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene, a single layer of carbon atoms, exhibits unique electronic properties due to its Dirac cone band structure.
  • Electronic Raman scattering is a powerful technique for probing electron dynamics, but direct observation in graphene has been challenging.

Purpose of the Study:

  • To directly observe and characterize polarization-resolved electronic Raman scattering in a gated monolayer graphene device.
  • To validate theoretical predictions for nonresonant Raman processes involving interband electron-hole excitations.
  • To establish the utility of electronic Raman scattering for investigating graphene's electronic properties.

Main Methods:

  • Utilized a gated monolayer graphene device to control carrier concentration.
  • Performed polarization-resolved electronic Raman scattering measurements.
  • Analyzed spectral evolution with gate voltage and polarization dependence.

Main Results:

  • Successfully observed polarization-resolved electronic Raman scattering signals.
  • Spectra evolution with gate voltage and polarization matched theoretical expectations for interband excitations across the Dirac cone.
  • Demonstrated that the signal's spectral dependence is described by graphene's dynamical polarizability.

Conclusions:

  • Direct observation of Dirac fermion excitations via electronic Raman scattering in graphene is achieved.
  • This technique provides a new avenue for Raman investigations of electronic properties in graphene and other two-dimensional (2D) crystals.