TY - JOUR

T1 - Superconducting proximity effect and universal conductance fluctuations

AU - Heikkila, Tero T.

AU - Salomaa, Martti M.

AU - Lambert, Colin J.

PY - 1999/10/1

Y1 - 1999/10/1

N2 - We examine universal conductance fluctuations (UCF's) in mesoscopic normal-superconducting-normal (N-S-N) structures using a numerical solution of the Bogoliubov-de Gennes equation. We discuss two cases depending on the presence ("open" structure) or absence ("closed" structure) of quasiparticle transmission. In contrast to N-S structures, where the onset of superconductivity increases fluctuations, we find that UCF's are suppressed by superconductivity for N-S-N structures. We demonstrate that the fluctuations in ''open'' and "closed" structures exhibit distinct responses to an applied magnetic field and to an imposed phase variation of the superconducting order parameter.

AB - We examine universal conductance fluctuations (UCF's) in mesoscopic normal-superconducting-normal (N-S-N) structures using a numerical solution of the Bogoliubov-de Gennes equation. We discuss two cases depending on the presence ("open" structure) or absence ("closed" structure) of quasiparticle transmission. In contrast to N-S structures, where the onset of superconductivity increases fluctuations, we find that UCF's are suppressed by superconductivity for N-S-N structures. We demonstrate that the fluctuations in ''open'' and "closed" structures exhibit distinct responses to an applied magnetic field and to an imposed phase variation of the superconducting order parameter.

U2 - 10.1103/PhysRevB.60.9291

DO - 10.1103/PhysRevB.60.9291

M3 - Journal article

VL - 60

SP - 9291

EP - 9294

JO - Physical review B

JF - Physical review B

SN - 0163-1829

IS - 13

ER -