Condensed Matter

    

Tuning of Lifetime of Cooper pairs in a Massive Aluminum Ring

Authors: Stanislav Dolgopolov

Here we propose an experiment showing that a persistent supercurrent decays when its electron pairs break and recombine, i.e. when paired electrons are interchangeable with normal (single) electrons. We produce a small non-superconducting area in a massive superconducting (SC) aluminum. Electron pairs break and recombine in the non-SC area, so newly created pairs can drift from the non-SC area into SC area and replace initial electron pairs, which flow in a persistent supercurrent in the SC area. The drift and, thus, the replacement rate are directly related to the size of contact area between SC and non-SC zones, so the supercurrent lifetime is inversely related to the size of the contact area. Thus we show that the supercurrent vanishes because its electron pairs experience creation/annihilation and are not permanent.

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Submission history

[v1] 2023-10-21 06:07:36

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