Broadband response of the quasiparticle current in a superconducting tunnel junction

Journal Article · Mon Feb 14 04:00:00 EST 1994 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.110994· OSTI ID:5222100

Verghese, S; Karadi, C; Mears, C A; Orenstein, J; Richards, P L ^[1]; Barfknecht, A T ^[2]

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1. Department of Physics, University of California and Materials Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
2. Conductus, Inc., Sunnyvale, California 94086 (United States)

We have measured the linear response of the quasiparticle current in a Nb/AlO[sub [ital x]]/Nb junction from 75--200 GHz. Picosecond pulses of millimeter wave radiation were generated by illuminating a photoconductive switch with a mode-locked laser. The pulses were coupled to the junction through an impedance-mismatched, planar lithographed antenna. The broadband response of the superconductor-insulator-superconductor junction was measured by monitoring changes in the dc current induced by interfering two electrical pulses at the junction as a function of the time delay between them. The data are in agreement with the linear theory of photon-assisted tunneling.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5222100
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 64:7; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
FUNCTIONS
JUNCTIONS
METALS
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
RADIATIONS
RADIOWAVE RADIATION
RESPONSE FUNCTIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SPECTRAL RESPONSE
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENTS
TUNNEL DIODES