R. K. Kaul et al 2005 Europhys. Lett. 71 973 doi:10.1209/epl/i2005-10184-1
R. K. Kaul, D. Ullmo, S. Chandrasekharan and H. U. Baranger
Show affiliationsWe 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 ETh). 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.
Condensed matter: electrical, magnetic and optical
Issue 6 (September 2005)
Received 29 April 2005, accepted for publication 21 July 2005, in final form 21 July 2005
Published 24 August 2005
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