Coherent superposition of photon- and phonon-assisted tunneling in coupled 
quantum dots

Qin, H.; Holleitner, A. W.; Eberl, K.; Blick, R. H.

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Coherent superposition of photon- and phonon-assisted tunneling in coupled quantum dots

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Eberl, K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Blick, R. H.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Qin, H., Holleitner, A. W., Eberl, K., & Blick, R. H. (2001). Coherent superposition of photon- and phonon-assisted tunneling in coupled quantum dots. Physical Review B, 64(24): 241302.

Cite as: https://hdl.handle.net/21.11116/0000-000E-E587-7

Abstract

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 AlxGa1-
xAs/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.