Superconducting proximity effect and universal conductance fluctuations

Heikkila, Tero T. and Salomaa, Martti M. and Lambert, Colin J. (1999) Superconducting proximity effect and universal conductance fluctuations. Physical review B, 60 (13). pp. 9291-9294. ISSN 0163-1829

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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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Journal Article
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Physical review B
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23 Oct 2012 08:30
Last Modified:
21 Nov 2022 22:50