Effects of charging-energy fluctuations on an anomalous behavior of mesoscopic Josephson junctions

Journal Article · Sun Mar 31 23:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.7695· OSTI ID:5792960

Tolpin, A E ^[1]

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1. Naval Research Laboratory, Washington, D.C. 20375 (US)

A theory is proposed for mesoscopic Josephson junctions in the low-temperature intermediate quantum regime in which such junctions are characterized by a large single-electron charging energy {ital E}{sub {ital c}} that is of the order of the Josephson energy, {ital E}{sub {ital J}}. This contrasts with the classical Josephson junctions where the Josephson energy {ital E}{sub {ital J}} is usually dominant. In this intermediate regime the phase difference of the order parameters for left and right superconductors is no longer localized. In particular, it is believed that at low temperature the quantum phase fluctuations play a very important role. By employing functional-integral methods to the junction Hamiltonian, the resistive regimes of the mesoscopic Josephson junctions below the critical current are studied. It is shown that the Josephson current acquires a spectral decomposition, characterized by the spectral width {Delta}{sub {omega}}. The relative values of {Delta}{sub {omega}} and the voltage {ital V} are shown to determine the resistive regimes in the junction.

• OSTI ID: 5792960
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; 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
CHARGE CARRIERS
FLUCTUATIONS
HAMILTONIANS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL OPERATORS
ORDER PARAMETERS
QUANTUM OPERATORS
SUPERCONDUCTING JUNCTIONS
VARIATIONS