Kondo and mixed valence regimes in multi-level quantum dots

Abstract

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.

REVTEX file with two eps figures

References in corpus (6)

• Kondo effect in an integer-spin quantum dot
• Out-of-equilibrium Kondo effect in Double Quantum Dots
• Enhancement of Kondo effect in quantum dots with an even number of electrons
• Conduction through a quantum dot near a singlet-triplet transition
• Interactions and Interference in Quantum Dots: Kinks in Coulomb Blockade Peak Positions
• Mesoscopic fluctuations of the ground state spin of a small metal particle

Cited by in corpus (8)

• Interference in interacting quantum dots with spin
• Non-equilibrium Kondo effect in asymmetrically coupled quantum dot
• Suppression of Kondo screening by the Dicke effect in multiple quantum dots
• Flux-quantum-modulated Kondo conductance in a multielectron quantum dot
• Quasistates in a ring coupled to a reservoir and their relation to the Dicke effect
• Kondo Regime of a Quantum Dot Molecule: A Finite-U Slave-Boson Approach
• Kondo effect in a two-level quantum dot coupled to an external fermionic reservoir
• Persistent current in a ring coupled to an external fermionic reservoir