Two-stage Kondo effect in a quantum dot at high magnetic field

Abstract

We report a strong Kondo effect (Kondo temperature ~ 4K) at high magnetic field in a selective area growth semiconductor quantum dot. The Kondo effect is ascribed to a singlet-triplet transition in the ground state of the dot. At the transition, the low-temperature conductance approaches the unitary limit. Away from the transition, for low bias voltages and temperatures, the conductance is sharply reduced. The observed behavior is compared to predictions for a two-stage Kondo effect in quantum dots coupled to single-channel leads.

4 pages, 5 figures

References in corpus (3)

• Kondo effect in real quantum dots
• Quantum Phase Transition in a Multi-Level Dot
• Kondo effect induced by a magnetic field

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