| Issue |
Europhys. Lett.
Volume 71, Number 6, September 2005
|
|
|---|---|---|
| Page(s) | 973 - 979 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10184-1 | |
| Published online | 24 August 2005 | |
Mesoscopic Kondo problem
Department of Physics, Duke University - Durham, NC 27708-0305, USA
Received:
29
April
2005
Accepted:
21
July
2005
We study the effect of mesoscopic fluctuations on a magnetic
impurity coupled to a spatially confined electron gas with a
temperature in the mesoscopic range (i.e. between the
mean level spacing Δ and the Thouless energy
). Comparing “poor-man's scaling” with exact
Quantum Monte Carlo, we find that for temperatures larger than
the Kondo temperature, many aspects of the fluctuations can be
captured by the perturbative technique. Using this technique in
conjunction with semi-classical approximations, we are able to
calculate the mesoscopic fluctuations for a wide variety of
systems. For temperatures smaller than the Kondo temperature, we
find large fluctuations and deviations from the universal
behavior.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 72.15.Qm – Scattering mechanisms and Kondo effect / 73.63.Kv – Quantum dots
© EDP Sciences, 2005
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