Non-linear transport properties of superconducting nanostructures

Martin, A M and Lambert, C J (1996) Non-linear transport properties of superconducting nanostructures. Journal of Physics: Condensed Matter, 8 (49). L731-L738. ISSN 0953-8984

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By solving the Bogoliubov-de Gennes equation seIf-consistently, we compute transport properties of a one dimensional superconducting island with a delta-function normal scatterer at the centre. The calculated I-V characteristics show significant structure, arising from the competition between scattering processes at the boundaries of the island and modification of the order parameter by quasi-particles and superflow. At a certain critical current, the order parameter exhibits a quasi-first-order transition to the normal state, smeared by the finite system size. At this point, the differential conductance is negative and can have a magnitude greater than 2e(2)/h, despite the fact that there is only a single scattering channel.

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Journal of Physics: Condensed Matter
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24 Oct 2012 14:28
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21 Nov 2022 22:52