We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Giant conductance oscillations in mesoscopic An...
View graph of relations

« Back

Giant conductance oscillations in mesoscopic Andreev interferometers

Research output: Contribution to journalLetter


<mark>Journal publication date</mark>1996
<mark>Journal</mark>Journal of Physics: Condensed Matter
Number of pages8
<mark>Original language</mark>English


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.