PHOTON-ASSISTED TUNNELING IN DOUBLE-BARRIER SUPERCONDUCTING TUNNEL-JUNCTIONS

Authors
DIERICHS MMTM DIELEMAN P WEZELMAN JJ HONINGH CE KLAPWIJK TM
Citation
Mmtm. Dierichs et al., PHOTON-ASSISTED TUNNELING IN DOUBLE-BARRIER SUPERCONDUCTING TUNNEL-JUNCTIONS, Applied physics letters, 64(7), 1994, pp. 921-923
Citations number
12
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
64
Issue
7
Year of publication
1994
Pages
921 - 923
Database
ISI
SICI code
0003-6951(1994)64:7<921:PTIDST>2.0.ZU;2-5
Abstract
Double-barrier Nb/Al2O3/Al/Al2O3/Nb tunnel junctions are used as mixin g elements in a 345 GHz waveguide mixer. Noise temperatures (double si de band) down to 720 K at 3.0 K are obtained without the need to apply a magnetic field to suppress the Josephson current. It is shown that the composite barrier acts as a single barrier for photon-assisted tun neling. Surprisingly, at these frequencies the capacitance of two stac ked tunnel barriers is only determined by one barrier.