Crossover from Josephson tunneling to the Coulomb blockade in small tunnel junctions

Journal Article · Mon Jun 06 00:00:00 EDT 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.60.2414· OSTI ID:5304850

Iansiti, M; Johnson, A T; Lobb, C J; Tinkham, M

We have fabricated small tunnel junctions with a variety of ratios of charging energy E/sub c/ to Josephson coupling energy E/sub J/ and measured their I-V characteristics. For E/sub c/approx.E/sub J/, the I-V curve is resistive at all currents and the critical current is greatly reduced, in agreement with our theoretical estimates. As E/sub J/ is further reduced by application of a magnetic field, we find a novel regime in which aspects of the Coulomb blockade of tunneling coexist with features typical of Josephson tunneling. At still higher magnetic fields, the junction becomes normal and shows the simple Coulomb blockade.

• Research Organization: Physics Department and Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
• OSTI ID: 5304850
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 60:23
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
JOSEPHSON JUNCTIONS
FABRICATION
TUNNEL EFFECT
CRITICAL CURRENT
MAGNETIC FIELDS
CURRENTS
ELECTRIC CURRENTS
JUNCTIONS
SUPERCONDUCTING JUNCTIONS
420201* - Engineering- Cryogenic Equipment & Devices