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Title
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Superconducting nanowires: interplay of discrete transverse modes with supercurrent
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Author
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Abstract
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| From a numerical solution of the Bogoliubov-de Gennes equations, we investigate an interplay of the transverse discrete modes with a longitudinal supercurrent in a metallic cylindrical superconducting nanowire. The superconductor-to-normal transition induced by a longitudinal superflow of electrons is found to occur as a cascade of jumps in the order parameter (supercurrent and superfluid density) as a function of the superfluid velocity for diameters d<1015 nm (for Al parameters) and sufficiently low temperatures T<0.30.4Tc, with Tc the critical temperature. When approaching Tc, the jumps are smoothed into steplike but continuous drops. A similar picture occurs for d>1520 nm. Only when the diameter exceeds 5070 nm the quantum-size cascades are fully washed out, and we arrive at the mesoscopic regime. Below this regime the critical current density jc exhibits the quantum-size oscillations with pronounced resonant enhancements: the smaller the diameter, the more significant is the enhancement. Thickness fluctuations of real samples will smooth out such oscillations into an overall growth of jc with decreasing nanowire diameter. |
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Language
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English
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Source (journal)
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Physical review : B : solid state. - Lancaster, Pa, 1970 - 1978
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Publication
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Lancaster, Pa
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2009
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ISSN
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0556-2805
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DOI
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10.1103/PHYSREVB.80.024513
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Volume/pages
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80
:2
(2009)
, p. 024513,1-024513,11
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ISI
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000268617500092
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Full text (Publisher's DOI)
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Full text (open access)
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