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

Elzerman, Jeroen M.; De Franceschi, Silvano; Goldhaber-Gordon, David; van der Wiel, Wilfred G.; Kouwenhoven, Leo P.

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

Authors

Elzerman, Jeroen M.

De Franceschi, Silvano

Goldhaber-Gordon, David

van der Wiel, Wilfred G.

Kouwenhoven, Leo P.

Description

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.
15 pages