TY  - JOUR
AU  - Behner, Gerrit
AU  - Jalil, Abdur Rehman
AU  - Rupp, Alina
AU  - Lüth, Hans
AU  - Grützmacher, Detlev
AU  - Schäpers, Thomas
TI  - Superconductive Coupling Effects in Selectively Grown Topological Insulator-Based Three-Terminal Junctions
JO  - ACS nano
VL  - 19
IS  - 3
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2025-01927
SP  - 3878 - 3885
PY  - 2025
AB  - 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 Bi0.8Sb1.2Te3 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.
LB  - PUB:(DE-HGF)16
C6  - 39806296
UR  - <Go to ISI:>//WOS:001396496000001
DO  - DOI:10.1021/acsnano.4c15893
UR  - https://juser.fz-juelich.de/record/1040560
ER  -