Observation of incoherent relaxation by tunneling in a macroscopic two-state system

The dynamics of a dissipative, quantized macroscopic two-state system have been experimentally investigated through the measurement of tunneling transitions between the adjacent, equal-energy fluxoid states of a superconducting loop containing Josephson junctions. The tunneling rate {Gamma} has been...

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Bibliographic Details
Published in:Physical review letters 1991-02, Vol.66 (6), p.810-813
Main Authors: HAN, S, LAPOINTE, J, LUKENS, J. E
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
DAMPING
DATA
ENERGY LOSSES
Exact sciences and technology
EXPERIMENTAL DATA
FLUCTUATIONS
FUNCTIONS
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
LOSSES
MAGNETIC FLUX
MECHANICS
NUMERICAL DATA
Physics
POTENTIALS
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
QUANTUM MECHANICS
RELAXATION
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
SUPERCONDUCTING COILS
SUPERCONDUCTING JUNCTIONS
Superconductivity
SYMMETRY
TUNNEL EFFECT
VARIATIONS 426001 > Engineering-- Superconducting Devices & Circuits-- (1990-)
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Summary:The dynamics of a dissipative, quantized macroscopic two-state system have been experimentally investigated through the measurement of tunneling transitions between the adjacent, equal-energy fluxoid states of a superconducting loop containing Josephson junctions. The tunneling rate {Gamma} has been observed to approach zero as a power law in the temperature, giving a damping parameter {alpha}=1.44, in the incoherent relaxation regime. The predicted exponential dependence of {Gamma} on barrier height has been quantitatively confirmed.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.66.810