[22p-D214-1~15] 9.5 New functional materials and new phenomena

▼ [22p-D214-2] Microwave spectroscopy of Andreev states in mesoscopic InAs nanowire-based hybrid Josephson junctions

〇(P)Patrick Zellekens¹, Russell Deacon^1,2, Pujitha Perla^3,4, Mihail Lepsa^3,4, Detlev Gruetzmacher^3,4, Thomas Schaepers^3,4, Koji Ishibashi^1,2 (1.RIKEN CEMS, Japan, 2.Adv. Device Lab., Japan, 3.Forschungszentrum Julich, Germany, 4.JARA-FIT, Germany)

Keywords:Semiconductor nanowires, Superconductivity, Majorana fermions

Mesoscopic Josephson junctions can act as building blocks for quantum systems such as the Andreev level or spin qubit or novel topological devices. Here, we present the microwave-assisted characterization of an in-situ InAs/Al halfshell nanowire Josephson junction embedded in a RF-SQUID loop. The device chip is coupled to a sapphire-based coplanar waveguide resonator by means of a Flip-Chip approach, which allows the independent fabrication and optimization of the nanowire structure and the microwave circuit. Single- and two-tone spectroscopy measurements reveal internal quality factors of up to 500000 and the presence of spin-polarized Andreev bound states in the nanowire Josephson junction.