Nonequilibrium Kondo Effect in a Multi-level Quantum Dot near singlet-triplet transition

Details Nonequilibrium Kondo Effect in a Multi-level Quantum Dot near singlet-triplet transition Nonequilibrium Kondo Effect in a Multi-level Quantum Dot near singlet-triplet transition

2002-05-14

arxiv.org/abs/cond-mat/0205278v3

Phys. Rev. B 66, 113310 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.113310

The linear and nonlinear transport through a multi-level lateral quantum dot connected to two leads is investigated using a generalized finite-$U$ slave-boson mean field approach. For a two-level quantum dot, our calculation demonstrates a substantial conductance enhancement near the degeneracy point of the spin singlet and triplet states, a non-monotonic temperature-dependence of conductance and a sharp dip and nonzero bias maximum of the differential conductance. These agree well with recent experiment observations. This two-stage Kondo effect in an out-of-equilibrium situation is attributed to the interference between the two energy levels.

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