Giant Conductance Oscillations In Mesoscopic Andreev Interferometers

Details Giant Conductance Oscillations In Mesoscopic Andreev Interferometers Giant Conductance Oscillations In Mesoscopic Andreev Interferometers

1995-04-27

arxiv.org/abs/cond-mat/9504113v1

Physics

Condensed Matter

4 pages of Revtex, 6 figures available on request

Scientific paper

10.1088/0953-8984/8/26/001

We analyze the electrical conductance $G(\phi)$ of a two-dimensional, phase coherent structure in contact with two superconductors, which is known to be an oscillatory function of the phase difference $\phi$ between the superconductors. It is predicted that for a metallic sample, the amplitude of oscillation is enhanced by placing a normal barrier at the interface and that, by tuning the strength of the barrier, can be orders of magnitude greater than values observed in recent experiments. Giant oscillations can also be obtained without a barrier, provided a crucial sum rule is broken. This can be achieved by disorder induced normal scattering. In the absence of zero phase inter-channel scattering, the conductance possesses a zero phase minimum.

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