Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Theory 1

TT 14.3: Talk

Monday, March 16, 2020, 15:45–16:00, HSZ 204

Size of the Cooper pair in the Dynes superconductor — •Frantisek Herman — ETH, Zurich, Switzerland

After focusing on thermodynamic and spectroscopic properties considering role of the impurities on BCS superconductors within the Dynes phenomenology framework, here we turn to microscopic description of the underlying superconductive state. Within this talk, we provide detail analysis of the size of the Cooper pair as well as its underlying wave-function. We show that this length scale remains constant even at the critical disorder scattering, meanwhile the coherence length provided by the Ginzburg-Landau theory diverges, which shows that superconductor-metal transition driven by pair-breaking disorder occurs due to long-distance decoherence even when the Cooper pairs are locally stable. This mechanism is therefore very similar to the superconductor-metal transition driven by temperature. Presented analysis might be useful also from the point of view of preparing entangled state of electrons, since it deals with the pair-breaking as well as pair-conserving scattering rates effecting the size of the Cooper pair in different way.