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TT: Fachverband Tiefe Temperaturen

TT 22: Poster Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology

TT 22.3: Poster

Thursday, September 30, 2021, 13:30–16:00, P

Andreev bound states in disordered superconductors — •Idan Tamir — FU Berlin

At strong enough disorder, superconductivity losses its uniformity and exhibits local gap variations. These are considered a precursor for the eventual breakdown of superconductivity. Using high resolution tunneling spectroscopy to locally study amorphous superconducting films, we observe an abundance of sharp in-gap excitations. We relate these excitations to Andreev bound states induced by either large superconducting gap variations or the interaction with native magnetic impurities. Both possibilities are not accommodated in current theoretical models.