Electronic Cooling in Graphene

Details Electronic Cooling in Graphene Electronic Cooling in Graphene

2009-01-27

arxiv.org/abs/0901.4159v2

Phys. Rev. Lett. 102, 206410 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

corrected typos and added references

Scientific paper

Energy transfer to acoustic phonons is the dominant low-temperature cooling channel of electrons in a crystal.For cold neutral graphene we find that the weak cooling power of its acoustical modes relative to the heat capacity of the system leads to a power law decay of the electronic temperature when far from equilibrium. For heavily doped graphene a high electronic temperature is shown to initially decrease linearly with time at a rate proportional to n^(3/2) with n being the electronic density. We discuss the relative importance of optical and acoustic phonons to cooling.

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