Korshunov instantons in a superconductor at elevated bias current
Daniel Otten, Fabian Hassler
DOI 10.1103/PhysRevB.96.125433 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Even at zero temperature dissipation reduces quantum fluctuations and tends to localize particles. A notable exception is the nonlinear dissipation due to quasiparticle tunneling in a Josephson junction. It is well known that quasiparticle dissipation does not suppress tunneling of the superconducting phase difference between next-nearest metastable phase states even though tunneling to the nearest phase state is suppressed. The reason is that the dissipative action admits an instanton solution, the so-called Korshunov instanton. Here, we analyze this model at elevated bias current I. We find that besides the known regime where the logarithm of the tunneling rate scales as I2/3 there is a novel regime with a scaling I2. We argue that the increased tunneling rate that derives from the elevated bias current is favorable for experimental verification of the Korshunov instantons.
Similar papers
Korshunov instantons in a superconductor at elevated bias current
similarity 0.94Daniel Otten & Fabian Hassler · 2017 · arXiv:1705.03015
Source status unknown — claims are unverified
Nonequilibrium effects in tunnel Josephson junctions
similarity 0.90E. V. Bezuglyi et al.
Source status unknown — claims are unverified
Effect of zero-energy bound states on macroscopic quantum tunneling in high-Tc superconductor junctions
similarity 0.88Shiro Kawabata et al.
Source status unknown — claims are unverified
Gate-assisted phase fluctuations in all-metallic Josephson junctions
similarity 0.87J. Basset et al.
Source status unknown — claims are unverified
Observation of combined Josephson and charging effects in small tunnel junction circuits
similarity 0.87T. A. Fulton et al.
Source status unknown — claims are unverified
Theory of the Josephson effect in unconventional superconducting junctions with diffusive barriers
similarity 0.87T. Yokoyama et al.
Source status unknown — claims are unverified