Superconductive coupling and Josephson diode effect in selectively-grown topological insulator based three-terminal junctions
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 $\mathrm{Bi_{0.8}Sb_{1.2}Te_3}$ 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 multi-terminal geometry induced diode effect. We find good agreement of our findings with a resistively and capacitively shunted junction network model.
Authors 5
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Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
JARA-Fundamentals of Future Information Technology , Jülich-Aachen Research Alliance , Forschungszentrum Jülich and RWTH Aachen University , Germany
Peter Grünberg Institut (PGI-9) , Forschungszentrum Jülich , 52425 Jülich , Germany
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Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
JARA-Fundamentals of Future Information Technology , Jülich-Aachen Research Alliance , Forschungszentrum Jülich and RWTH Aachen University , Germany
Peter Grünberg Institut (PGI-9) , Forschungszentrum Jülich , 52425 Jülich , Germany
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