Resonant Tunneling through Multi-Level and Double Quantum Dots
  We study resonant tunneling through quantum-dot systems in the presence of strong Coulomb repulsion and coupling to the metallic leads. Motivated by recent experiments we concentrate on (i) a single dot with two energy levels and (ii) a double dot with one level in each dot. Each level is twofold spin-degenerate. Depending on the level spacing these systems are physical realizations of different Kondo-type models. Using a real-time diagrammatic formulation we evaluate the spectral density and the non-linear conductance. The latter shows a novel triple-peak resonant structure. 
T. Pohjola (1 and 2), J. K\"onig (2), M. M. Salomaa (1), J. Schmid   (3), H. Schoeller (2), and Gerd Sch\"on (1 and 2) ((1) ...