Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-07-09
Phys. Rev. B 68, 245311 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 8 figures. Minor comments added in last version
Scientific paper
10.1103/PhysRevB.68.245311
We study the interplay between Coulomb blockade and the Kondo effect in quantum dots. We use a self-consistent scheme which describes mesoscopic devices in terms of a collective phase variable (slave rotor) and quasiparticle degrees of freedom. In the strong Coulomb blockade regime, we recover the description of metallic islands in terms of a phase only action. For a dot with well-separated levels, our method leads to the Kondo effect. We identify the regime where a crossover between the Coulomb blockade regime at high temperatures and the formation of a Kondo resonance at lower temperature takes place. In addition, we find that for a dot with many overlapping resonances, an {\it inverse crossover} can take place. A Kondo resonance which involves many levels within the dot is first formed, and this coherent state is suppressed by correlation effects at lower temperatures. A narrower Kondo resonance, due to a single level in the dot can emerge at even lower temperatures.
Florens Serge
Georges Antoine
Guinea Francisco
Jose San P.
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