Fig. 2: Characterization of the tunnel probes by differential conductance measurements.
From: Subgap spectroscopy along hybrid nanowires by nm-thick tunnel barriers
G as a function of Vb and B along the nanowire of Device 1 measured by (a) probe P0, (b) probe P1, (c) probe P2 and (d) probe P3 consecutively connected as in Setup V1 (top row). The gate settings are VTG = 2.1 V and VSG = 0 V. A red marker indicate the linecuts at zero field and the corresponding traces are shown in logarithmic scale (bottom row). By finding the coherence peak positions, a superconducting gap Δ is extracted to be (a) 290 ± 6 μeV, (b) 298 ± 3 μeV, (c) 305 ± 11 μeV and (d) 301 ± 5 μeV.
