Compensation of the spin of a quantum dot at Coulomb blockade

Details Compensation of the spin of a quantum dot at Coulomb blockade Compensation of the spin of a quantum dot at Coulomb blockade

2001-02-02

arxiv.org/abs/cond-mat/0102039v1

Proceedings of Macroscopic Quantum Coherence and Computing, Silvestrini and Averin Editors, June 2000, Napoli; Kluwer Academic

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 3 figures

Scientific paper

We discuss a new entangled state that has been observed in the conduction across a quantum dot. At Coulomb blockade, electrons from the contacts correlate strongly to those localized in the dot, due to cotunneling processes. Because of the strong Coulomb repulsion on the dot, its electron number is unchanged w.r.to the dot in isolation, but the total spin is fully or partly compensated. In a dot with N=even at the singlet-triplet crossing, which occurs in large magnetic field, Kondo correlations lead to a total spin S=1/2.

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