We present a study of spin 1/2 Kondo singlets in single electron transistors under a microwave frequency bias excitation. We compare time-averaged conductance G to predicted universal response with respect to microwave frequency, oscillation amplitude and the Kondo temperature and find a non-adiabatic response when the microwave photon energy hf is comparable to the Kondo temperature kBTK. We show that our measurements are qualitatively consistent with the predictions for the radiation-induced decoherence rate of the Kondo spin.
@article{arxiv.1304.0037,
title = {Dynamic response of a spin-1/2 Kondo singlet},
author = {Bryan Hemingway and Stephen Herbert and Michael Melloch and Andrei Kogan},
journal= {arXiv preprint arXiv:1304.0037},
year = {2015}
}