%0 Journal Article
%T Superposition of photon- and phonon- assisted tunneling in coupled quantum dots
%A H. Qin
%A A. W. Holleitner
%A K. Eberl
%A R. H. Blick
%J Physics
%D 2000
%I arXiv
%R 10.1103/PhysRevB.64.241302
%X We report on electron transport through an artificial molecule formed by two tunnel coupled quantum dots, which are laterally confined in a two-dimensional electron system of an Al$_x$Ga$_{1-x}$As/GaAs heterostructure. Coherent molecular states in the coupled dots are probed by photon-assisted tunneling (PAT). Above 10 GHz, we observe clear PAT as a result of the resonance between the microwave photons and the molecular states. Below 8 GHz, a pronounced superposition of phonon- and photon-assisted tunneling is observed. Coherent superposition of molecular states persists under excitation of acoustic phonons.
%U http://arxiv.org/abs/cond-mat/0011155v2