Superconducting proximity effect and universal conductance fluctuations
Tero T. Heikkilä, Martti M. Salomaa, Colin J. Lambert
DOI 10.1103/PhysRevB.60.9291 · Physical Review B
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Abstract
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.
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