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We describe the gap voltage depression and current–voltage (I–V) characteristics in pumped niobium superconductor–insulator–superconductor junction with niobium titanium nitride tuning stripline by introducing an electron heating power contribution resulting from the photon-assisted tunneling process. Theoretical fits using the extended Tien–Gordon theory are obtained that reproduce the most salient features of the pumped I–V characteristics.

Electron heating by photon-assisted tunneling in niobium terahertz mixers with integrated niobium titanium nitride striplines