Heteroatomic Andreev molecule in a superconducting island-double quantum dot hybrid
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913410362376192 |
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| author | Kürtössy, Olivér Bodócs, Mihály Moca, Cătălin Paşcu Scherübl, Zoltán Nikodem, Ella Kanne, Thomas Nygård, Jesper Zaránd, Gergely Makk, Péter Csonka, Szabolcs |
| author_facet | Kürtössy, Olivér Bodócs, Mihály Moca, Cătălin Paşcu Scherübl, Zoltán Nikodem, Ella Kanne, Thomas Nygård, Jesper Zaránd, Gergely Makk, Péter Csonka, Szabolcs |
| contents | Topological superconductors (SCs) hold great promise for fault-tolerant quantum hardware, however, their experimental realization is very challenging. Recently, superconducting artificial molecules (Andreev molecules) have opened new avenues to engineer topological superconducting materials. In this work, we demonstrate a heteroatomic Andreev molecule, where two normal artificial atoms realized by quantum dots (QDs) are coupled by a superconducting island (SCI). We show that the two normal atoms strongly hybridize and form a 3-electron-based molecular state. Our density matrix renormalization group (DMRG) calculations explain quantitatively the robust binding of electrons. The tunability of the structure allows us to drive a quantum phase transition from an antiferromagnetic Andreev molecular state to a heteroatomic Andreev molecule with ferromagnetically coupled QDs using simple electrical gating. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_00825 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Heteroatomic Andreev molecule in a superconducting island-double quantum dot hybrid Kürtössy, Olivér Bodócs, Mihály Moca, Cătălin Paşcu Scherübl, Zoltán Nikodem, Ella Kanne, Thomas Nygård, Jesper Zaránd, Gergely Makk, Péter Csonka, Szabolcs Mesoscale and Nanoscale Physics Topological superconductors (SCs) hold great promise for fault-tolerant quantum hardware, however, their experimental realization is very challenging. Recently, superconducting artificial molecules (Andreev molecules) have opened new avenues to engineer topological superconducting materials. In this work, we demonstrate a heteroatomic Andreev molecule, where two normal artificial atoms realized by quantum dots (QDs) are coupled by a superconducting island (SCI). We show that the two normal atoms strongly hybridize and form a 3-electron-based molecular state. Our density matrix renormalization group (DMRG) calculations explain quantitatively the robust binding of electrons. The tunability of the structure allows us to drive a quantum phase transition from an antiferromagnetic Andreev molecular state to a heteroatomic Andreev molecule with ferromagnetically coupled QDs using simple electrical gating. |
| title | Heteroatomic Andreev molecule in a superconducting island-double quantum dot hybrid |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.00825 |