Heteroatomic Andreev Molecule in a Superconducting Island–Double Quantum Dot Hybrid
Olivér Kürtössy, Mihály Bodócs, Cătălin Paşcu Moca, Zoltán Scherübl, Ella Nikodem, Thomas Kanne, Jesper Nygård, Gergely Zaránd, Péter Makk, Szabolcs Csonka
TL;DR
Researchers created a new type of superconducting molecule that could help in building fault-tolerant quantum hardware.
Contribution
The novel contribution is the demonstration of a tunable heteroatomic Andreev molecule using a superconducting island and quantum dots.
Findings
A three-electron-based molecular state is formed by coupling two quantum dots through a superconducting island.
DMRG calculations confirm the robust binding of electrons in the system.
Electrical gating enables a quantum phase transition between antiferromagnetic and ferromagnetic coupling states.
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…
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Taxonomy
TopicsTopological Materials and Phenomena · Quantum and electron transport phenomena · Graphene research and applications