Non-Equilibrium Quasiclassical Theory for Josephson Structures

Details Non-Equilibrium Quasiclassical Theory for Josephson Structures Non-Equilibrium Quasiclassical Theory for Josephson Structures

2002-07-31

arxiv.org/abs/cond-mat/0207724v5

Phys. Rev. B 68, 054505 (2003)

Physics

Condensed Matter

Superconductivity

11 pages, 9 figures, Final version to appear in PRB

Scientific paper

10.1103/PhysRevB.68.054505

We present a non-equilibrium quasiclassical formalism suitable for studying linear response ac properties of Josephson junctions. The non-equilibrium self-consistency equations are satisfied, to very good accuracy, already in zeroth iteration. We use the formalism to study ac Josephson effect in a ballistic superconducting point contact. The real and imaginary parts of the ac linear conductance are calculated both analytically (at low frequencies) and numerically (at arbitrary frequency). They show strong temperature, frequency, and phase dependence. Many anomalous properties appear near phi = pi. We ascribe them to the presence of zero energy bound states.

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