Research output: Contribution to Journal/Magazine › Letter › peer-review
Research output: Contribution to Journal/Magazine › Letter › peer-review
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TY - JOUR
T1 - Giant conductance oscillations in mesoscopic Andreev interferometers
AU - Allsopp, N K
AU - Cañizares, J S
AU - Raimondi, R
AU - Lambert, Colin
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
U2 - 10.1088/0953-8984/8/26/001
DO - 10.1088/0953-8984/8/26/001
M3 - Letter
VL - 8
SP - L377-L384
JO - Journal of Physics: Condensed Matter
JF - Journal of Physics: Condensed Matter
SN - 0953-8984
IS - 26
ER -