2019_EJRNL_PP_L__TOSI_1.pdf
Terbatas Ratnasari
» ITB
Terbatas Ratnasari
» ITB
We perform microwave spectroscopy of Andreev states in superconducting weak links tailored in an
InAs-Al (core-full shell) epitaxially grown nanowire. The spectra present distinctive features with bundles
of four lines crossing when the superconducting phase difference across the weak link is 0 or ?.We interpret these features as arising from zero-field spin-split Andreev states. A simple analytical model, which takes into account the Rashba spin-orbit interaction in a nanowire containing several transverse subbands,
explains these features and their evolution with magnetic field. Our results show that the spin degree of
freedom is addressable in Josephson junctions and constitute a first step towards its manipulation.