Proximity-induced superconductivity in (Bi1−xSbx)2Te3 topological-insulator nanowires

When a topological insulator is made into nanowire, the interplay between topology and size quantization gives rise to peculiar one-dimensional states whose energy dispersion can be manipulated by external fields. In presence of proximity-induced superconductivity, these 1D offer tunable platform for Majorana zero modes. While existence such has been experimentally confirmed, realization robust superconductivity in topological-insulator nanowires remains challenge. Here, we report superconducting based on (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ (BST) thin films. two rectangular pads palladium are deposited BST film with separation 100--200 nm, beneath converted superconductor, leaving nanowire in-between. We found that interface epitaxial high electronic transparency, leading induced nanowire. Due its suitable geometry gate-tuning, this promising future studies