Quantum fluctuations in a current-biased Josephson junction of small capacitance

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.10901· OSTI ID:5117544

Tagliacozzo, A; Ventriglia, F; Apell, P ^[1]

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1. Dipartimento di Scienze Fisiche, Universita di Napoli e Gruppo Nazionale di Struttura della Materia, Consiglio Nazionale delle Ricerche, Mostra d'Oltremare Pad. 19, I-80125 Napoli, Italy (IT)

Quantum fluctuations of the charge at a current-biased Josephson junction and of the Josephson current couple to the quasiparticle tunneling when the system is at equilibrium in the zero-voltage state. The effect of reducing the capacitance of the junction is studied by means of a model Hamiltonian. When this becomes smaller, charge fluctuations are reduced, but the effective dissipation is also lowered so that the junction displays an underdamped behavior. The Josephson branch is shifted at the voltage {ital e}/2{ital C} because of charging due to the quasiparticles. A path-integral formulation of the model leads to a high dynamical subgap resistance at {ital I}{r arrow}0, as recently found experimentally.

• OSTI ID: 5117544
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAPACITANCE
DISSIPATION FACTOR
ELECTRICAL PROPERTIES
FLUCTUATIONS
FLUX QUANTIZATION
JOSEPHSON JUNCTIONS
JUNCTIONS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT
VARIATIONS