Energy relaxation in graphene and its measurement with supercurrent

J. Voutilainen, A. Fay, P. Häkkinen, J. K. Viljas, T. T. Heikkilä, P. J. Hakonen

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)
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Abstract

We study inelastic energy relaxation in graphene for low energies to find out how electrons scatter with acoustic phonons and other electrons. By coupling the graphene to superconductors, we create a strong dependence of the measured signal, i.e., critical Josephson current, on the electron population on different energy states. Since the relative population of high- and low-energy states is determined by the inelastic scattering processes, the critical current becomes an effective probe for their strength. We argue that the electron-electron interaction is the dominant relaxation method and we estimate a scattering time τe−e=0.1…1 ps at T=500 mK, 1-2 orders of magnitude smaller than predicted for normal two-dimensional diffusive systems.
Original languageEnglish
Article number045419
Pages (from-to)1-10
Number of pages10
JournalPhysical Review B
Volume84
Issue number4
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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