Heteroatomic Andreev molecule in a superconducting island-double quantum dot hybrid
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 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.
Keywords
Cite
@article{arxiv.2407.00825,
title = {Heteroatomic Andreev molecule in a superconducting island-double quantum dot hybrid},
author = {Olivér Kürtössy and Mihály Bodócs and Cătălin Paşcu Moca and Zoltán Scherübl and Ella Nikodem and Thomas Kanne and Jesper Nygård and Gergely Zaránd and Péter Makk and Szabolcs Csonka},
journal= {arXiv preprint arXiv:2407.00825},
year = {2024}
}