Nonequilibrium Josephson current in ballistic multiterminal SNS-junctions

Details Nonequilibrium Josephson current in ballistic multiterminal SNS-junctions Nonequilibrium Josephson current in ballistic multiterminal SNS-junctions

2000-05-08

arxiv.org/abs/cond-mat/0005141v1

Physics

Condensed Matter

Superconductivity

Proceeding of MS2000, to appear in Physica C

Scientific paper

10.1016/S0921-4534(00)01699-3

We study the nonequilibrium Josephson current in a long two-dimensional ballistic SNS-junction with a normal reservoir coupled to the normal part of the junction. The current for a given superconducting phase difference $\phi$ oscillates as a function of voltage applied between the normal reservoir and the SNS-junction. The period of the oscillations is $\pi \hbar v_F/L$, with $L$ the length of the junction, and the amplitude of the oscillations decays as $V^{-3/2}$ for $eV \gg \hbar v_{F}/L$ and zero temperature. The critical current $I_c$ shows a similar oscillating, decaying behavior as a function of voltage, changing sign every oscillation. Normal specular or diffusive scattering at the NS-interfaces does not qualitatively change the picture.

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