Figure 1. Outline of the experiment.

(a) Tunnelling diagrams of the generator junction at the sum-gap voltage 2Δ<eV<4Δ and the detector junction at zero bias (s-wave case). (b) Scanning electron microscope image of the studied sample. The field of view is ∼60 × 22 μm². Ten mesa structures are marked by yellow dotted lines. (c) A three-dimensional sketch of the sample. Arrows indicate a bias configuration with mesa 6a as generator and 6b as detector.