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

Proximity-induced superconductivity in (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ topological-insulator nanowires