Two-Stage Kondo Effect in a Quantum Dot at a High Magnetic Field
Two-Stage Kondo Effect in a Quantum Dot at a High Magnetic Field
We report a strong Kondo effect (Kondo temperature approximately 4 K) 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 …