Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field

Golovach, V. N. and Loss, D.. (2003) Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field. Europhysics Letters, Vol. 62, H. 1. pp. 83-89.

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Official URL: http://edoc.unibas.ch/dok/A5254704

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We study the interplay between Kondo correlations and the singlet-triplet exchange splitting K between the two spins in a double quantum dot. We calculate the cotunneling current with elastic and inelastic contributions and its renormalization due to Kondo correlations, away and at the degeneracy point K = 0. We show that these Kondo correlations induce pronounced peaks in the conductance G as a function of magnetic field B, inter-dot coupling t(H), and temperature. The long-range part of the Coulomb interaction becomes visible due to Kondo correlations resulting in an additional peak in G vs. t(H) with a strong B-field dependence. These conductance peaks thus provide direct experimental access to K, and thus to a crucial control parameter for spin-based qubits and entanglement.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Les ├ęditions de physique
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:44

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