Cooper-pair tunneling in small junctions with tunable Josephson coupling

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.6608· OSTI ID:383257

Harada, Y; Takayanagi, H ^[1]; Odintsov, A A ^[2]

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1. NTT Basic Research Laboratories 3-1 Morinosato-Wakamiya, Atsugi-shi 243-01 (Japan)
2. Department of Applied Physics, Delft University of Technology, P.O. Box 5046, 2628 CJ Delft (The Netherlands)

We investigate Cooper-pair tunneling in a circuit consisting of two dc-superconducting quantum inter- ference devices in series, with a gate capacitively coupled to the central island. Measurements cover a wide range of values of the ratio between Josephson coupling energy {ital E}{sub {ital J}} and charging energy {ital E}{sub {ital C}}. The {ital E}{sub {ital J}}/{ital E}{sub {ital C}} ratio dependence of the supercurrent is well described by the orthodox theory provided that strong fluctuations of the Josephson phase due to the electromagnetic environment are taken into account. Our data can be interpreted in terms of squeezing of the charge fluctuations with decreasing {ital E}{sub {ital J}}/{ital E}{sub {ital C}} ratio. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383257
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALUMINIUM
ALUMINIUM OXIDES
COOPER PAIRS
IV CHARACTERISTIC
JOSEPHSON EFFECT
MAGNETIC FIELD EFFECTS
NIOBIUM
SQUID DEVICES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT