1202.3394 (A. S. Price et al.)

Non-linear resistivity and heat dissipation in monolayer graphene    [PDF]

A. S. Price, S. M. Hornett, A. V. Shytov, E. Hendry, D. W. Horsell

We have experimentally studied the nonlinear nature of electrical conduction
in monolayer graphene devices on silica substrates. This nonlinearity manifests
itself as a nonmonotonic dependence of the differential resistance on applied
DC voltage bias across the sample. At temperatures below ~70K, the differential
resistance exhibits a peak near zero bias that can be attributed to
self-heating of the charge carriers. We show that the shape of this peak arises
from a combination of different energy dissipation mechanisms of the carriers.
The energy dissipation at higher carrier temperatures depends critically on the
length of the sample. For samples longer than 10um the heat loss is shown to be
determined by optical phonons at the silica-graphene interface.

View original: http://arxiv.org/abs/1202.3394