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Excitation of Resistive States in Superconducting Films by Using Electrical and Light Pulses
Jean-Paul Maneval,Fran cois-Ren e Ladan,J.C. Villegier,Vu Dinh Lam,Phan Hong Khoi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The resistance induced by nanosecond pulses of electric currrent or of light has been studied in superconducting Nb and NbN thin lms. Narrow bridges exhibit the features expected from quasi-1D transport, namely, localized phase-slip centers (PSC) and hot spots (HS), depending upon the prescribed conditions of temperature and applied current. PSC and HS are clearly identied from their characteristic delay and their evolution in time. We then analyze the response to combined pulsed illumination and current. Using very thin (4 nm) niobium-nitride lms, it was possible to detect the visible light delivered photon by photon. The resistance induced by nanosecond pulses of electric currrent or of light has been studied in superconducting Nb and NbN thin lms. Narrow bridges exhibit the features expected from quasi-1D transport, namely, localized phase-slip centers (PSC) and hot spots (HS), depending upon the prescribed conditions of temperature and applied current. PSC and HS are clearly identied from their characteristic delay and their evolution in time. We then analyze the response to combined pulsed illumination and current. Using very thin (4 nm) niobium-nitride lms, it was possible to detect the visible light delivered photon by photon.
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