Quantum fluctuations and quantum dynamics of small Josephson junctions

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681741· OSTI ID:6041353

Panyukov, S V; Zaikin, A D

The quantum properties of small Josephson junctions with both linear Ohmic and quasiparticle (cosine) dissipation are investigated by means of a real-time path-integral technique. Quantum diffusion of the quasicharge and quantum corrections to the classical conductivity are analyzed. The current-voltage characteristics and the effect of voltage steps are studied. It is shown that coherent voltage oscillations may exist not only for small, but also for large values of the junction tunneling conductivity. For not very small values of the quasiparticle conductivity of the junction the frequency of these oscillations is twice the Bloch oscillation frequency. The quantum dynamics of the phase difference across the junction is studied for a wide region of parameters. It is shown that linear and cosine dissipation mechanisms cause the presence of two dissipative phase transitions, which are qualitatively different from each other in many aspects.

• Research Organization: P.N. Lebedev Physical Institute, Moscow (USSR)
• OSTI ID: 6041353
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 73:1-2; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOPER PAIRS
COULOMB FIELD
DENSITY MATRIX
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FILMS
FLUCTUATIONS
INSTANTONS
INTEGRALS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
LEPTONS
MATHEMATICAL MODELS
MATRICES
MECHANICS
PARTICLE MODELS
PHYSICAL PROPERTIES
QUANTUM MECHANICS
QUASI PARTICLES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TRANSPORT THEORY
TUNNEL EFFECT
VARIATIONS