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TT: Fachverband Tiefe Temperaturen
TT 76: Superconductivity: Tunnelling and Josephson Junctions II
TT 76.8: Talk
Thursday, March 21, 2024, 17:00–17:15, H 3010
Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctions — Andrea Iorio1, Alessandro Crippa1, Bianca Turini1, Sedighe Salimian1, Matteo Carrega2, Luca Chirolli1, Valentina Zannier1, Lucia Sorba1, Elia Strambini1, Francesco Giazotto1, and •Stefan Heun1 — 1NEST, 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