Heteroatomic Andreev Molecule in a Superconducting Island-Double Quantum Dot Hybrid

Kürtössy, Olivér and Bodocs, Mihaly and Moca, Catalin Pascu and Scherubl, Zoltan and Nikodem, Ella and Kanne, Thomas and Nygard, Jesper and Zarand, Gergely and Makk, Peter and Csonka, Szabolcs (2026) Heteroatomic Andreev Molecule in a Superconducting Island-Double Quantum Dot Hybrid. NANO LETTERS. ISSN 1530-6984 (In Press)

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Abstract

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.

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