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Bolometric response in graphene based superconducting tunnel junctions

by: Heli Vora, Piranavan Kumaravadivel, Bent Nielsen, Xu Du
Applied Physics Letters, Vol. 100, No. 15. (2012), 153507, doi:10.1063/1.3703117  Key: citeulike:12147055

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Abstract

We fabricate graphene-TiOx-aluminum tunnel junctions and characterize their radio frequency response. Below the superconducting critical temperature of aluminum and when biased within the superconducting gap, the devices show enhanced dynamic resistance which increases with decreasing temperature. Application of radio frequency radiation affects the dynamic resistance through electronic heating. The relation between the electron temperature rise and the absorbed radiation power is measured, from which the bolometric parameters, including heat conductance, noise equivalent power, and responsivity, are characterized.


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