Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pgs, 1 fig
Scientific paper
The rates for electron-lattice cooling in graphene can be slow due to a small Fermi surface size and the momentum-conserving character of electron-phonon scattering, which severely constrain energy transfer per collision. We analyze alternative cooling pathways mediated by `supercollisions' that have lower frequency but transfer higher energy than normal collisions. We demonstrate that supercollisions, such as disorder-assisted phonon scattering and two-phonon scattering, can dominate over momentum-conserving channels under realistic conditions. In the disorder-assisted regime, the cooling rate can be changed by orders of magnitude by varying the amount of disorder. This opens the way for using graphene as a platform in a variety of applications that rely on hot-carrier transport. Anomalous sensitivity to disorder and sign reversal of the temperature dependence can serve as a diagnostic of this new energy transport regime.
Levitov Leonid S.
Reizer Michael Y.
Song Justin C. W.
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