Lakic, Lazar and Lawrie, William I. L. and van Driel, David and Stehouwer, Lucas E. A. and Su, Yao and Veldhorst, Menno and Scappucci, Giordano and Kuemmeth, Ferdinand and Chatterjee, Anasua (2025) A quantum dot in germanium proximitized by a superconductor. NATURE MATERIALS, 24 (4). pp. 552-558. ISSN 1476-1122, 1476-4660
Full text not available from this repository. (Request a copy)Abstract
As one of the few group IV materials with the potential to host superconductor-semiconductor hybrid devices, planar germanium hosting proximitized quantum dots is a compelling platform to achieve and combine topological superconductivity with existing and new qubit modalities. We demonstrate a quantum dot in a Ge/SiGe heterostructure proximitized by a platinum germanosilicide (PtSiGe) superconducting lead, forming a superconducting lead-quantum dot-superconducting lead junction. We show tunability of the coupling strength between the quantum dot and the superconducting lead, and gate control of the ratio of charging energy and the induced gap, and we tune the ground state of the system between even and odd parity. Furthermore, we characterize critical magnetic field strengths, finding a critical out-of-plane field of 0.90 +/- 0.04 T. Finally, we explore sub-gap spin splitting, observing rich physics in the resulting spectra, that we model using a zero-bandwidth model in the Yu-Shiba-Rusinov limit. Our findings open up the physics of alternative spin and superconducting qubits, and the physics of Josephson junction arrays, in germanium.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATE |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jul 2026 08:03 |
| Last Modified: | 28 Jul 2026 08:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67068 |
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