title: Photothermal response in dual-gated bilayer graphene.
abstract: 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.
authors.affiliation: Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: M-H
authors.initials: MH
authors.lastname: Kim
authors.affiliation: Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA and Physics Department, University of Massachusetts, Amherst, Massachusetts 01002, USA.
authors.forename: J
authors.initials: J
authors.lastname: Yan
authors.affiliation: Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Suess
authors.affiliation: Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: T E
authors.initials: TE
authors.lastname: Murphy
authors.affiliation: Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA and School of Physics, Monash University, 3800 Victoria, Australia.
authors.forename: M S
authors.initials: MS
authors.lastname: Fuhrer
authors.affiliation: Department of Physics, Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: H D
authors.initials: HD
authors.lastname: Drew