Abstract
Thermal excitation and zero-point motion bring about fluctuations in the gauge-invariant phase coupling across Josephson junctions. These fluctuations are studied in a simple picture incorporating both the resistively shunted junction (RSJ) model and the Ambegaokar-Baratoff theory. A diagram of the parameter space of a junction delineating a boundary between the phase-coupled and phase-decoupled regimes is obtained. Estimates of the root-mean-square voltage fluctuations justify the use of the normal-state tunneling resistance rather than the temperature-dependent quasiparticle tunneling resistance in the RSJ model at the boundary.
Original language | English (US) |
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Pages (from-to) | 3491-3494 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 34 |
Issue number | 5 |
DOIs | |
State | Published - 1986 |