| Issue |
Europhys. Lett.
Volume 62, Number 1, April 2003
|
|
|---|---|---|
| Page(s) | 83 - 89 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00365-x | |
| Published online | 01 March 2003 | |
Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field
Department of Physics and Astronomy, University of
Basel Klingelbergstrasse 82, CH-4056 Basel, Switzerland
Received:
27
May
2002
Accepted:
17
January
2003
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 
, and temperature. The long-range part of the
Coulomb interaction becomes visible due to Kondo correlations
resulting in an additional peak in G
vs.
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.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 72.15.Qm – Scattering mechanisms and Kondo effect / 73.63.-b – Electronic transport in mesoscopic or nanoscale materials and structures
© EDP Sciences, 2003
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