M. -H. Kim, J. Yan, R. J. Suess, T. E. Murphy, M. S. Fuhrer, H. D. Drew
The photovoltaic and bolometric photoresponse in gapped bilayer graphene was investigated by optical and transport measurements. The photovoltaic photoresponse was established to be associated with hot electron thermal relaxation by comparing with transport and optical bolometric responses. Using a pulse coincidence technique at 1.5 um, it was found that the bolometric and photovoltaic response times are identical. Response times of tau ~ 100 - 20 ps were found for temperatures from 3 - 100 K. Above 10 K, the relaxation time was observed to be tau = 25 +/- 5 ps, independent of temperature within noise.
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http://arxiv.org/abs/1301.3165
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