Superposition of photon- and phonon- assisted tunneling in coupled quantum dots

Details Superposition of photon- and phonon- assisted tunneling in coupled quantum dots Superposition of photon- and phonon- assisted tunneling in coupled quantum dots

2000-11-09

arxiv.org/abs/cond-mat/0011155v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.64.241302

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.

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