article published yes Kushagra Aggarwal author b22ab905-3539-11eb-84c3-fc159dcd79cb0000-0001-9985-9293 Andrea C Hofmann author 340F461A-F248-11E8-B48F-1D18A9856A87 Daniel Jirovec author 4C473F58-F248-11E8-B48F-1D18A9856A870000-0002-7197-4801 Ivan Prieto Gonzalez author 2A307FE2-F248-11E8-B48F-1D18A9856A870000-0002-7370-5357 Amir Sammak author Marc Botifoll author Sara Martí-Sánchez author Menno Veldhorst author Jordi Arbiol author Giordano Scappucci author Jeroen Danon author Georgios Katsaros author 38DB5788-F248-11E8-B48F-1D18A9856A870000-0001-8342-202X GeKa department Majorana bound states in Ge/SiGe heterostructures project TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS project Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid superconductor-semiconductor devices. A key challenge towards hybrid Ge-based quantum technologies is the design of high-quality interfaces and superconducting contacts that are robust against magnetic fields. In this work, by combining the assets of aluminum, which provides good contact to the Ge, and niobium, which has a significant superconducting gap, we demonstrate highly transparent low-disordered JoFETs with relatively large ICRN products that are capable of withstanding high magnetic fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs, opening up an avenue to explore topological superconductivity in planar Ge. The persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves the way towards integrating spin qubits and proximity-induced superconductivity on the same chip. https://research-explorer.ista.ac.at/download/10559/10561/2021_PhysRevResearch_Aggarwal.pdf application/pdfno American Physical Society2021 eng general engineering 2643-1564 2012.0032210.1103/physrevresearch.3.l022005 32 https://research-explorer.ista.ac.at/record/8834 https://research-explorer.ista.ac.at/record/8831 Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez, Amir Sammak, Marc Botifoll, Sara Martí-Sánchez, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” <i>Physical Review Research</i>. American Physical Society, 2021. <a href="https://doi.org/10.1103/physrevresearch.3.l022005">https://doi.org/10.1103/physrevresearch.3.l022005</a>. Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A., Botifoll, M., … Katsaros, G. (2021). Enhancement of proximity-induced superconductivity in a planar Ge hole gas. <i>Physical Review Research</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevresearch.3.l022005">https://doi.org/10.1103/physrevresearch.3.l022005</a> Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M, Martí-Sánchez S, Veldhorst M, Arbiol J, Scappucci G, Danon J, Katsaros G. 2021. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical Review Research. 3(2), L022005. K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M. Botifoll, S. Martí-Sánchez, M. Veldhorst, J. Arbiol, G. Scappucci, J. Danon, G. Katsaros, Physical Review Research 3 (2021). Aggarwal, Kushagra, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” <i>Physical Review Research</i>, vol. 3, no. 2, L022005, American Physical Society, 2021, doi:<a href="https://doi.org/10.1103/physrevresearch.3.l022005">10.1103/physrevresearch.3.l022005</a>. K. Aggarwal <i>et al.</i>, “Enhancement of proximity-induced superconductivity in a planar Ge hole gas,” <i>Physical Review Research</i>, vol. 3, no. 2. American Physical Society, 2021. Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. <i>Physical Review Research</i>. 2021;3(2). doi:<a href="https://doi.org/10.1103/physrevresearch.3.l022005">10.1103/physrevresearch.3.l022005</a> 105592021-12-16T18:50:57Z2025-04-15T08:38:16Z