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

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

2001-10-20

arxiv.org/abs/cond-mat/0110432v1

Phys. Rev. Lett. 88, 126803 (2002).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.126803

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.

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