Compensation of the Spin of a Quantum dot at Coulomb Blockade

Domenico Giuliano (), Benoit Jouault () and Arturo Tagliacozzo ()
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Domenico Giuliano: Stanford University, Department of Physics
Benoit Jouault: Université Montpellier 11, GES, UMR 5650
Arturo Tagliacozzo: Università di Napoli “Federico II”, Dipartimento di Scienze Fisiche

A chapter in Macroscopic Quantum Coherence and Quantum Computing, 2001, pp 325-340 from Springer

Abstract: Abstract 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.

Keywords: quantum dot; Kondo effect. PACS 71.10.Ay; 72.15.Qm; 73.23.-b; 73.23.Hk; 79.60.Jv; 73.61.-r (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/978-1-4615-1245-5_33

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