Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.19: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Generalising Beenakker equation to take into account evanescent modes — •Daniel Kruti and Roman-Pascal Riwar — Institute for Theoretical Nanoelectronics (PGI-2), Jülich Research Centre and Institute for Theoretical Physics, University of Cologne

Superconductor–normal-metal–superconductor Josephson junctions have been examined extensively in past years. In particular, the case where the normal region is modelled by an ideal normal conductor with an intermittent scattering region can be well described by the celebrated Beenakker equation. Strictly speaking however, this equation is applicable only in the asymptotic plain wave limit, neglecting evanescent modes. However, the situation is changing by recent experimental advances. First, conductor regions are now fabricated with significantly decreased impurity scattering, leading to situations where scattering is dominated by the junction geometry. Second, miniaturisation is advancing such that evanescent modes should no longer be neglected. While this regime has already been captured by numerical methods, we here strive for an explicit analytical treatment, and generalise the Beenakker equation to short junctions with geometric scattering.