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arXiv · 2112.05625

Signatures of interactions in the Andreev spectrum of nanowire Josephson junctions

F. J. Matute-Cañadas·C. Metzger·Sunghun Park·L. Tosi·P. Krogstrup·J. Nygård·M. F. Goffman·C. Urbina·H. Pothier·A. Levy Yeyati
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Abstract

We performed microwave spectroscopy of an InAs nanowire between superconducting contacts implementing a finite-length, multi-channel Josephson weak link. Certain features in the spectra, such as the splitting by spin-orbit interactions of the transition lines among Andreev states, have been already understood in terms of non-interacting models. However, we identify here additional transitions, which evidence the presence of Coulomb interactions. By combining experimental measurements and model calculations, we reach a qualitative understanding of these very rich Andreev spectra.

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F. J. Matute-Cañadas, C. Metzger, Sunghun Park, L. Tosi, P. Krogstrup, J. Nygård, M. F. Goffman, C. Urbina, H. Pothier, A. Levy Yeyati. 2021-12-10. Signatures of interactions in the Andreev spectrum of nanowire Josephson junctions. https://doi.org/10.1103/physrevlett.128.197702

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