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Giant conductance oscillations in mesoscopic Andreev interferometers

Allsopp, N K and Cañizares, J S and Raimondi, R and Lambert, Colin (1996) Giant conductance oscillations in mesoscopic Andreev interferometers. Journal of Physics: Condensed Matter, 8 (26). L377-L384. ISSN 0953-8984

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Abstract

We analyse 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 ballistic sample, the amplitude of oscillation will be enhanced by placing a normal barrier at the normal-superconducting interface, and that by tuning the strength of the barrier, it can be made orders of magnitude greater than values observed in recent experiments. Giant oscillations can also be obtained without a barrier, provided that 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 and a maximum at phi = pi.

Item Type: Article
Journal or Publication Title: Journal of Physics: Condensed Matter
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 58154
Deposited By: ep_importer_pure
Deposited On: 24 Oct 2012 16:26
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58154

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