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Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 76: Superconductivity: Tunnelling and Josephson Junctions II

TT 76.8: Vortrag

Donnerstag, 21. März 2024, 17:00–17:15, H 3010

Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctionsAndrea Iorio1, Alessandro Crippa1, Bianca Turini1, Sedighe Salimian1, Matteo Carrega2, Luca Chirolli1, Valentina Zannier1, Lucia Sorba1, Elia Strambini1, Francesco Giazotto1, and •Stefan Heun11NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy — 2CNR-SPIN, Via Dodecaneso 33, 16146 Genoa, Italy

We investigate a ballistic InSb nanoflag-based Josephson junction with Nb superconducting contacts. The high transparency of the superconductor-semiconductor interfaces enables the exploration of quantum transport with parallel short and long conducting channels. Under microwave irradiation, we observe half-integer Shapiro steps that are robust to temperature, suggesting their possible nonequilibrium origin. Our results demonstrate the potential of ballistic InSb nanoflags Josephson junctions as a valuable platform for understanding the physics of hybrid devices and investigating their nonequilibrium dynamics.

This research activity was partially supported by the FET-OPEN project AndQC (H2020 Grant No. 828948), PNRR MUR Project No. PE0000023-NQSTI, and PRIN MUR (Grant No. 2022PH852L).

Keywords: Josephson junctions; Shapiro steps; InSb nanoflags

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