Kondo effect and mesoscopic fluctuations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Pramana - Journal of Physics Année : 2011

Kondo effect and mesoscopic fluctuations

Résumé

Two important themes in nanoscale physics in the last two decades are correlations between electrons and mesoscopic fluctuations. Here we review our recent work on the intersection of these two themes. The setting is the Kondo effect, a paradigmatic example of correlated electron physics, in a nanoscale system with mesoscopic fluctuations; in particular, we consider a small quantum dot coupled to a finite reservoir (which itself may be a large quantum dot). We discuss three aspects of this problem. First, in the high-temperature regime, we argue that a Kondo temperature TK which takes into account the mesoscopic fluctuations is a relevant concept: for instance, physical properties are universal functions of T/TK. Secondly, when the temperature is much less than the mean level spacing due to confinement, we characterize a natural cross-over from weak to strong coupling. This strong coupling regime is itself characterized by well-defined single-particle levels, as one can see from a Nozières Fermi-liquid theory argument. Finally, using a mean-field technique, we connect the mesoscopic fluctuations of the quasiparticles in the weak coupling regime to those at strong coupling.

Dates et versions

hal-00668499 , version 1 (09-02-2012)

Identifiants

Citer

Denis Ullmo, Sébastien Burdin, Dong E. Liu, Harold U. Baranger. Kondo effect and mesoscopic fluctuations. Pramana - Journal of Physics, 2011, 77 (5), pp.769-779. ⟨10.1007/s12043-011-0191-3⟩. ⟨hal-00668499⟩
25 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More