Energy relaxation in graphene and its measurement with supercurrent

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© 2011 American Physical Society (APS). This is the accepted version of the following article: Voutilainen, J. & Fay, A. & Häkkinen, P. & Viljas, J. K. & Heikkilä, T. T. & Hakonen, Pertti J. 2011. Energy relaxation in graphene and its measurement with supercurrent. Physical Review B. Volume 84, Issue 4. 045419/1-10. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.84.045419, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.84.045419.
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School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors

Date

2011

Department

Teknillisen fysiikan laitos
Department of Applied Physics

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Mcode

Degree programme

Language

en

Pages

045419/1-10

Series

Physical Review B, Volume 84, Issue 4

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.

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Keywords

quasi-particles, transport, metals

Other note

DOI

10.1103/physrevb.84.045419

Citation

Voutilainen, J. & Fay, A. & Häkkinen, P. & Viljas, J. K. & Heikkilä, T. T. & Hakonen, Pertti J. 2011. Energy relaxation in graphene and its measurement with supercurrent. Physical Review B. Volume 84, Issue 4. 045419/1-10. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.84.045419

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https://urn.fi/URN:NBN:fi:aalto-201509034231

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