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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Abstract
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) |
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UniBasel Contributors: | Loss, Daniel |
Item Type: | Article, refereed |
Article Subtype: | Research Article |
Publisher: | Les éditions de physique |
ISSN: | 0302-072X |
Note: | Publication type according to Uni Basel Research Database: Journal article |
Identification Number: |
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Last Modified: | 22 Mar 2012 14:25 |
Deposited On: | 22 Mar 2012 13:44 |
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