Multi-parameter scaling of the Kondo effect in quantum dots with an even number of electrons

Abstract

We address a recent theoretical discrepancy concerning the Kondo effect in quantum dots with an even number of electrons where spin-singlet and -triplet states are nearly degenerate. We show that the discrepancy arises from the fact that the Kondo scaling involves many parameters, which makes the results depend on concrete microscopic models. We illustrate this by the scaling calculations of the Kondo temperature, $T_K$, as a function of the energy difference between the singlet and triplet states $\Delta$. $T_K(\Delta )$ decreases with increasing $\Delta$, showing a crossover from a power law with a universal exponent to that with a nonuniversal exponent. The crossover depends on the initial parameters of the model.

8 pages, 3 figures

References in corpus (2)

• Kondo effect induced by a magnetic field
• Mean Field Theory of the Kondo Effect in Quantum Dots with an Even Number of Electrons

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• Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field
• Three-orbital Kondo effect in single quantum dot system with plural electrons
• Kondo Effect of Quantum Dots in the Quantum Hall Regime
• Spin-Dependent Transport Through a Colloidal Quantum Dot: The Role of Exchange Interactions