Publikation: Finite Length Effects and Coulomb Interaction in Ge Quantum Well-Based Josephson Junctions Probed with Microwave Spectroscopy
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Proximitized Ge quantum wells have emerged as a novel 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 m 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, Felix J. SCHUPP, Manuel HINDERLING, Steve W. BEDELL, Wolfgang BELZIG, Juan Carlos CUEVAS, Aleksandr SVETOGOROV, Fabrizio NICHELE, Deividas SABONIS, 2025. Finite Length Effects and Coulomb Interaction in Ge Quantum Well-Based Josephson Junctions Probed with Microwave SpectroscopyBibTex
@unpublished{tenKate2025-08-08Finit-74463,
title={Finite Length Effects and Coulomb Interaction in Ge Quantum Well-Based Josephson Junctions Probed with Microwave Spectroscopy},
year={2025},
author={ten Kate, Sofieke C. and Ohnmacht, David and Coraiola, Marco and Antonelli, Tommaso and Paredes, Stephan and Schupp, Felix J. and Hinderling, Manuel and Bedell, Steve W. 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 novel 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 m 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.</dcterms:abstract>
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