Electron-Phonon Coupling in Suspended Graphene: Supercollisions by Ripples

Antti Laitinen, Mika Oksanen, Aurélien Fay, Daniel Cox, Matti Tomi, Pauli Virtanen, Pertti J. Hakonen

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)
112 Downloads (Pure)

Abstract

Using electrical transport experiments and shot noise thermometry, we find strong evidence that “supercollision” scattering processes by flexural modes are the dominant electron–phonon energy transfer mechanism in high-quality, suspended graphene around room temperature. The power law dependence of the electron–phonon coupling changes from cubic to quintic with temperature. The change of the temperature exponent by two is reflected in the quadratic dependence on chemical potential, which is an inherent feature of two-phonon quantum processes.
Original languageEnglish
Pages (from-to)3009-3013
Number of pages5
JournalNano Letters
Volume14
Issue number6
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • electron-phonon scattering
  • flexural phonon
  • shot noise thermometry
  • Suspended graphene

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