Publikation: Finite-length effects and Coulomb interaction in Josephson junctions based on Ge quantum wells and probed with microwave spectroscopy
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2025
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ten Kate, Sofieke C.
Coraiola, Marco
Antonelli, Tommaso
Paredes, Stephan
Nichele, Fabrizio
Sabonis, Deividas
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Swiss National Science Foundation: 200021 201082
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Physical Review Applied. American Physical Society (APS). 2025, 24(6), 064005. eISSN 2331-7019. Verfügbar unter: doi: 10.1103/hb1h-8jn9
Zusammenfassung
Proximitized Ge quantum wells have emerged as a platform for studying Andreev bound states (ABSs) due to their expected strong spin-orbit interaction and high mobility. Here, we used microwave spectroscopy techniques to investigate ABSs in Josephson junctions (JJs) realized in proximitized Ge quantum wells. Spectroscopic signatures observed in a 350-nm junction indicated the presence of multiple ABSs and were reproduced with a model including finite-length effects. The ABS spectra measured for a 1.2-μm junction were explained by a model including three ABSs in two conduction channels and finite Coulomb interaction. Our work highlights the importance of interactions in JJs and serves as a basis for understanding and manipulating ABSs in Ge-based hybrid devices.
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TEN KATE, Sofieke C., David OHNMACHT, Marco CORAIOLA, Tommaso ANTONELLI, Stephan PAREDES, Wolfgang BELZIG, Juan Carlos CUEVAS, Aleksandr SVETOGOROV, Fabrizio NICHELE, Deividas SABONIS, 2025. Finite-length effects and Coulomb interaction in Josephson junctions based on Ge quantum wells and probed with microwave spectroscopy. In: Physical Review Applied. American Physical Society (APS). 2025, 24(6), 064005. eISSN 2331-7019. Verfügbar unter: doi: 10.1103/hb1h-8jn9BibTex
@article{tenKate2025-12-01Finit-75564,
title={Finite-length effects and Coulomb interaction in Josephson junctions based on Ge quantum wells and probed with microwave spectroscopy},
year={2025},
doi={10.1103/hb1h-8jn9},
number={6},
volume={24},
journal={Physical Review Applied},
author={ten Kate, Sofieke C. and Ohnmacht, David and Coraiola, Marco and Antonelli, Tommaso and Paredes, Stephan and Belzig, Wolfgang and Cuevas, Juan Carlos and Svetogorov, Aleksandr and Nichele, Fabrizio and Sabonis, Deividas},
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<dcterms:abstract>Proximitized Ge quantum wells have emerged as a platform for studying Andreev bound states (ABSs) due to their expected strong spin-orbit interaction and high mobility. Here, we used microwave spectroscopy techniques to investigate ABSs in Josephson junctions (JJs) realized in proximitized Ge quantum wells. Spectroscopic signatures observed in a 350-nm junction indicated the presence of multiple ABSs and were reproduced with a model including finite-length effects. The ABS spectra measured for a 1.2-μm junction were explained by a model including three ABSs in two conduction channels and finite Coulomb interaction. Our work highlights the importance of interactions in JJs and serves as a basis for
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