Photothermal response in dual-gated bilayer graphene

M. H. Kim, J. Yan, R. J. Suess, T. E. Murphy, M. S. Fuhrer, H. D. Drew

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The photovoltaic and bolometric photoresponse in gapped bilayer graphene was investigated by optical and transport measurements. A pulse coincidence technique at 1.5 μm was used to measure the response times as a function of temperature. The bolometric and photovoltaic response times were found to be identical implying that the photovoltaic response is also governed by hot electron thermal relaxation. Response times of τ∼100-20 ps were found for temperatures from 3-100 K. Above 10 K, the relaxation time was observed to be τ=25±5 ps, independent of temperature within noise.

Original languageEnglish
Article number247402
JournalPhysical Review Letters
Issue number24
StatePublished - Jun 14 2013


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