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Giant conductance oscillations in mesoscopic Andreev interferometers

Research output: Contribution to journalLetter

Published

Journal publication date1996
JournalJournal of Physics: Condensed Matter
Journal number26
Volume8
Number of pages8
PagesL377-L384
Original languageEnglish

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.