Spin-Dependent Josephson Current through Double Quantum Dots and Measurement of Entangled Electron States

Details Spin-Dependent Josephson Current through Double Quantum Dots and Measurement of Entangled Electron States Spin-Dependent Josephson Current through Double Quantum Dots and Measurement of Entangled Electron States

2000-01-03

arxiv.org/abs/cond-mat/0001011v2

Phys. Rev. B 62, 13 569 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; To appear in PRB; A few small changes including references

Scientific paper

10.1103/PhysRevB.62.13569

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.

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