Fig. 1: General concepts and experimental implementation.
From: Zero energy states clustering in an elemental nanowire coupled to a superconductor
a False-color scanning electron micrograph of the device. A CNT (white) is stapled on an array of Al/AlOx gates (thin) and Nb/Pd contacts (large) electrodes. The black arrows indicate where the CNT is electrically cut. Bias voltage Vsd is applied to the green contact which behaves as a normal reservoir. The brown contact behaves as a superconducting reservoir and is used as drain to measure the differential conductance through the device. The blue electrode is used as a back gate. External magnetic field B is applied perpendicular to the electrodes, making an angle θ = 14° with the CNT. b Illustration of the device showing the NW with small level spacing contacted to a normal reservoir (green) and to a superconducting reservoir (brown). The gate electrode (blue) is capacitively coupled to the NW. c Magnetic field dependence of the superconducting gap \({{{\Delta }}}_{j}^{*}\) of our Nb/Pd contacts using an Al/AlOx/Pd/Nb junction.
