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Non-linear transport properties of superconducting nanostructures

Research output: Contribution to journalLetter

<mark>Journal publication date</mark>2/12/1996
<mark>Journal</mark>Journal of Physics: Condensed Matter
Issue number49
Number of pages8
Pages (from-to)L731-L738
<mark>Original language</mark>English


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.