Hamburg 2001 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Mesoskopische Systeme
TT 8.11: Vortrag
Dienstag, 27. März 2001, 12:45–13:00, A
Kondo and mixed valence regimes in multi-level quantum dots — •Alexander Chudnovskiy1 and Sergio Ulloa2 — 1Fachbereich Physik, Universität Halle, D-06108 Halle/Saale, Germany — 2Department of Physics and Astronomy, Ohio University, Athens, OH 45701 USA
We investigate the dependence of the ground state of a multi-level quantum dot on the coupling to an external fermionic system and on the interactions in the dot. As the coupling to the external system increases, the rearrangement of the effective energy levels in the dot signals the transition from the Kondo regime to a mixed valence (MV) regime. The MV regime in a two level dot is characterized by an intrinsic mixing of the levels in the dot, resulting in non-perturbative sub- and super-tunneling phenomena that strongly influence the Kondo effect.