Heteroatomic Andreev Molecule in a Superconducting Island–Double Quantum Dot Hybrid
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 hybridize and form a three-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.
Authors
- Cătălin Paşcu Moca (ORCID: https://orcid.org/0000-0002-1299-399X)
- Jesper Nygård (ORCID: https://orcid.org/0000-0002-4639-5314)
- Zoltán Scherübl (ORCID: https://orcid.org/0000-0003-4075-589X)
- Olivér Kürtössy (ORCID: https://orcid.org/0000-0003-0221-403X)
- Thomas Kanne (ORCID: https://orcid.org/0000-0002-1533-2783)
- Szabolcs Csonka (ORCID: https://orcid.org/0000-0003-0505-2806)
- Gergely Zaránd (ORCID: https://orcid.org/0000-0001-7522-1826)
- Ella Nikodem
- Mihály Bodócs
- Péter Makk
Institutions
- University of Copenhagen (DK)
- University of Oradea (RO)
- University of Cologne (DE)
- Budapest University of Technology and Economics (HU)
- Quantum Devices (United States) (US)
- Montavid Thermodynamic Research Group (HU)
- HUN-REN Centre for Energy Research (HU)
Publication Details
- Journal
- Nano Letters
- Published
- 2026-02-17
- DOI
- https://doi.org/10.1021/acs.nanolett.5c04302
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Alexander von Humboldt-Stiftung
- Budapesti Műszaki és Gazdaságtudományi Egyetem
- National Research Foundation
- Danmarks Grundforskningsfond
- Hungarian Scientific Research Fund
- Magyar Tudományos Akadémia
- Novo Nordisk
- Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii
- Universität zu Köln
- Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
- Innovációs és Technológiai Minisztérium
- QuantERA
- Nemzeti Kutatási, Fejlesztési és Innovaciós Alap
- Colegiul Consultativ pentru Cercetare-Dezvoltare şi Inovare