Josephson current through a superconducting quantum point contact shorter than the coherence length
نویسندگان
چکیده
منابع مشابه
Understanding the Josephson current through a Kondo-correlated quantum dot.
We study the Josephson current 0-π transition of a quantum dot tuned to the Kondo regime. The physics can be quantitatively captured by the numerically exact continuous time quantum Monte Carlo method applied to the single-impurity Anderson model with Bardeen-Cooper-Schrieffer superconducting leads. For a comparison to an experiment, the tunnel couplings are determined by fitting the normal-sta...
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We tune the barrier of a Josephson junction through a zero-temperature metal-insulator transition and study the thermodynamic behavior of the junction in the proximity of the quantum-critical point. We examine a short-coherence-length superconductor and a barrier ~that is described by a Falicov-Kimball model! using the local approximation and dynamical mean-field theory. The inhomogeneous syste...
متن کاملErratum: Tuning a Josephson junction through a quantum critical point
We have corrected a problem in our computational code that determined the normal-state resistance. In general, we find a reduction of Rn when the correlations are large and there is more than one plane in the barrier. The reduction of Rn affects four figures from the original paper, and affects the conjecture about ‘‘intrinsic pinholes.’’ We discovered that our calculations had not fully conver...
متن کاملComment on "Josephson current through a nanoscale magnetic quantum dot".
We present theoretical results for the equilibrium Josephson current through an Anderson dot tuned into the magnetic regime, using Hirsch-Fye Monte Carlo simulations covering the complete crossover from Kondo-dominated physics to pi junction behavior in a numerically exact way. Within the "magnetic" regime, U/Gamma >> 1 and epsilon0/Gamma < or = 1, the Josephson current is found to depend only ...
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We report a new kind of experiment in which we take an array of nanoscale apertures that form a superfluid (4)He Josephson junction and apply quantum phase gradients directly along the array. We observe collective coherent behaviors from aperture elements, leading to quantum interference. Connections to superconducting and Bose-Einstein condensate Josephson junctions as well as phase coherence ...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1991
ISSN: 0031-9007
DOI: 10.1103/physrevlett.66.3056