Spin-Dependent Josephson Current through Double Quantum Dots and Measurement of Entangled Electron States
Mesoscale and Nanoscale Physics
2009-10-31 v2 Superconductivity
Abstract
We study a double quantum dot each dot of which is tunnel-coupled to superconducting leads. In the Coulomb blockade regime, a spin-dependent Josephson coupling between two superconductors is induced, as well as an antiferromagnetic Heisenberg exchange coupling between the spins on the double dot which can be tuned by the superconducting phase difference. We show that the correlated spin states-singlet or triplets-on the double dot can be probed via the Josephson current in a dc-SQUID setup.
Keywords
Cite
@article{arxiv.cond-mat/0001011,
title = {Spin-Dependent Josephson Current through Double Quantum Dots and Measurement of Entangled Electron States},
author = {Mahn-Soo Choi and C. Bruder and Daniel Loss},
journal= {arXiv preprint arXiv:cond-mat/0001011},
year = {2009}
}
Comments
4 pages, 4 figures; To appear in PRB; A few small changes including references