Granular aluminum induced superconductivity in germanium for hole spin-based hybrid devices
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866915923076579328 |
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| author | Fabris, Giorgio Falthansl-Scheinecker, Paul Shah, Devashish Pino, Daniel Michel Borovkov, Maksim Bubis, Anton Roux, Kevin Sokolova, Dina Juanes, Alejandro Andres Costanzo, Tommaso Taha, Inas Genç, Aziz Arbiol, Jordi Calcaterra, Stefano Oliveira, Afonso De Cerdeira Chrastina, Daniel Isella, Giovanni Souto, Ruben Seoane Calderon, Maria Jose Aguado, Ramon Abadillo-Uriel, Jose Carlos Katsaros, Georgios |
| author_facet | Fabris, Giorgio Falthansl-Scheinecker, Paul Shah, Devashish Pino, Daniel Michel Borovkov, Maksim Bubis, Anton Roux, Kevin Sokolova, Dina Juanes, Alejandro Andres Costanzo, Tommaso Taha, Inas Genç, Aziz Arbiol, Jordi Calcaterra, Stefano Oliveira, Afonso De Cerdeira Chrastina, Daniel Isella, Giovanni Souto, Ruben Seoane Calderon, Maria Jose Aguado, Ramon Abadillo-Uriel, Jose Carlos Katsaros, Georgios |
| contents | In superconductor-semiconductor hybrid structures, superconductivity and spin polarization are competing effects because magnetic fields break Cooper pairs. They can be combined using thin films and in-plane magnetic fields, an approach that enabled the pursuit of Majorana zero modes, Kitaev chains, and Andreev spin qubits (ASQs), but remains challenging for materials with small in-plane g-factors. Here we show that granular aluminum (grAl), composed of nanometer-scale aluminum grains embedded in an amorphous oxide matrix, can overcome this limitation. By depositing grAl on Ge/SiGe heterostructures, we induce a hard superconducting gap with BCS peaks at 305 $μ$eV and magnetic-field resilience for both the in-plane and out-of-plane directions, allowing Zeeman splitting of Yu-Shiba-Rusinov (YSR) states beyond 50 $μ$eV (12 GHz). Leveraging this robustness, we reveal signatures of hole physics and demonstrate g-tensor tunability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_21364 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Granular aluminum induced superconductivity in germanium for hole spin-based hybrid devices Fabris, Giorgio Falthansl-Scheinecker, Paul Shah, Devashish Pino, Daniel Michel Borovkov, Maksim Bubis, Anton Roux, Kevin Sokolova, Dina Juanes, Alejandro Andres Costanzo, Tommaso Taha, Inas Genç, Aziz Arbiol, Jordi Calcaterra, Stefano Oliveira, Afonso De Cerdeira Chrastina, Daniel Isella, Giovanni Souto, Ruben Seoane Calderon, Maria Jose Aguado, Ramon Abadillo-Uriel, Jose Carlos Katsaros, Georgios Mesoscale and Nanoscale Physics Superconductivity In superconductor-semiconductor hybrid structures, superconductivity and spin polarization are competing effects because magnetic fields break Cooper pairs. They can be combined using thin films and in-plane magnetic fields, an approach that enabled the pursuit of Majorana zero modes, Kitaev chains, and Andreev spin qubits (ASQs), but remains challenging for materials with small in-plane g-factors. Here we show that granular aluminum (grAl), composed of nanometer-scale aluminum grains embedded in an amorphous oxide matrix, can overcome this limitation. By depositing grAl on Ge/SiGe heterostructures, we induce a hard superconducting gap with BCS peaks at 305 $μ$eV and magnetic-field resilience for both the in-plane and out-of-plane directions, allowing Zeeman splitting of Yu-Shiba-Rusinov (YSR) states beyond 50 $μ$eV (12 GHz). Leveraging this robustness, we reveal signatures of hole physics and demonstrate g-tensor tunability. |
| title | Granular aluminum induced superconductivity in germanium for hole spin-based hybrid devices |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2602.21364 |