Energy relaxation in graphene and its measurement with supercurrent

Autor:	Voutilainen, Juha, Fay, Aurelien, Häkkinen, Pasi, Viljas, Janne K., Heikkilä, Tero T., Hakonen, Pertti J.
Rok vydání:	2011
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.84.045419
Popis:	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, in our model of two-dimensional electron-electron scattering, we find a scattering time $\tau_{e-e}=5... 13$ ps at T=500 mK, 1-2 orders of magnitude smaller than predicted by theory. Comment: 10 pages, 13 figures submitted to Physical Review B
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1103.3234 Zobrazit plný text záznamu View this record from Arxiv