Superconductive Coupling Effects in Selectively Grown Topological Insulator-Based Three-Terminal Junctions.

Behner, Gerrit; Jalil, Abdur Rehman; Rupp, Alina; Lüth, Hans; Grützmacher, Detlev; Schäpers, Thomas · ACS Nano · 2025

basic_science · Level V

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Abstract

The combination of an ordinary s-type superconductor with three-dimensional topological insulators creates a promising platform for fault-tolerant topological quantum computing circuits based on Majorana braiding. The backbone of the braiding mechanism are three-terminal Josephson junctions. It is crucial to understand the transport in these devices for further use in quantum computing applications. We present low-temperature measurements of topological insulator-based three-terminal Josephson junctions fabricated by a combination of selective-area growth of Bi<sub>0.8</sub>Sb<sub>1.2</sub>Te<sub>3</sub> and shadow mask evaporation of Nb. This approach allows for the in situ fabrication of Josephson junctions with an exceptional interface quality, important for the study of the proximity-effect. We map out the transport properties of the device as a function of bias currents and prove the coupling of the junctions by the observation of a multiterminal geometry-induced diode effect. We find good agreement of our findings with a resistively and capacitively shunted junction network model.