Fast energy relaxation of hot carriers near the dirac point of graphene

R. Somphonsane, H. Ramamoorthy, G. Bohra, G. He, D. K. Ferry, Y. Ochiai, N. Aoki, J. P. Bird

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We investigate energy relaxation of hot carriers in monolayer and bilayer graphene devices, demonstrating that the relaxation rate increases significantly as the Dirac point is approached from either the conduction or valence band. This counterintuitive behavior appears consistent with ideas of charge puddling under disorder, suggesting that it becomes very difficult to excite carriers out of these localized regions. These results therefore demonstrate how the peculiar properties of graphene extend also to the behavior of its nonequilibrium carriers.

Original languageEnglish (US)
Pages (from-to)4305-4310
Number of pages6
JournalNano Letters
Volume13
Issue number9
DOIs
StatePublished - Sep 11 2013

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Hot carriers
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Valence bands
Conduction bands
Graphene
Monolayers
graphene
Equipment and Supplies
energy
conduction bands
disorders
valence
Graphene devices

Keywords

  • electron-phonon scattering
  • energy relaxation
  • Graphene
  • hot carriers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering
  • Medicine(all)

Cite this

Somphonsane, R., Ramamoorthy, H., Bohra, G., He, G., Ferry, D. K., Ochiai, Y., ... Bird, J. P. (2013). Fast energy relaxation of hot carriers near the dirac point of graphene. Nano Letters, 13(9), 4305-4310. https://doi.org/10.1021/nl4020777

Fast energy relaxation of hot carriers near the dirac point of graphene. / Somphonsane, R.; Ramamoorthy, H.; Bohra, G.; He, G.; Ferry, D. K.; Ochiai, Y.; Aoki, N.; Bird, J. P.

In: Nano Letters, Vol. 13, No. 9, 11.09.2013, p. 4305-4310.

Research output: Contribution to journalArticle

Somphonsane, R, Ramamoorthy, H, Bohra, G, He, G, Ferry, DK, Ochiai, Y, Aoki, N & Bird, JP 2013, 'Fast energy relaxation of hot carriers near the dirac point of graphene', Nano Letters, vol. 13, no. 9, pp. 4305-4310. https://doi.org/10.1021/nl4020777
Somphonsane R, Ramamoorthy H, Bohra G, He G, Ferry DK, Ochiai Y et al. Fast energy relaxation of hot carriers near the dirac point of graphene. Nano Letters. 2013 Sep 11;13(9):4305-4310. https://doi.org/10.1021/nl4020777
Somphonsane, R. ; Ramamoorthy, H. ; Bohra, G. ; He, G. ; Ferry, D. K. ; Ochiai, Y. ; Aoki, N. ; Bird, J. P. / Fast energy relaxation of hot carriers near the dirac point of graphene. In: Nano Letters. 2013 ; Vol. 13, No. 9. pp. 4305-4310.
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