Suppression of the Kondo Effect in a Quantum Dot by Microwave Radiation

Details Suppression of the Kondo Effect in a Quantum Dot by Microwave Radiation Suppression of the Kondo Effect in a Quantum Dot by Microwave Radiation

1999-12-08

arxiv.org/abs/cond-mat/9912126v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages

Scientific paper

We have studied the influence of microwave radiation on the transport properties of a semiconductor quantum dot in the Kondo regime. In the entire frequency range tested (10--50 GHz), the Kondo resonance vanishes by increasing the microwave power. This suppression of the Kondo resonance shows an unexpected scaling behavior. No evidence for photon-sideband formation is found. The comparison with temperature-dependence measurements indicates that radiation-induced spin dephasing plays an important role in the suppression of the Kondo effect.

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