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HL: Halbleiterphysik

HL 7: Poster I

HL 7.81: Poster

Monday, March 26, 2001, 10:30–19:00, Rang S\ 3

Superposition of photon and phonon assisted tunneling in coupled quantum dots — •H. Qin¹, A.W. Holleitner¹, K. Eberl², and R.H. Blick¹ — ¹Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany. — ²Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany.

We report on electron transport through an artificial molecule formed by two tunnel coupled laterally gated quantum dots. The dots are of medium size containing roughly 200 electrons per dot. We find photon-assisted tunneling (PAT) of electrons through the double dot and probe the coherent molecular states by tuning the tunnel coupling between the dots. In addition, we observe PAT mediated by acoustic phonons below a threshold microwave frequency of around 8 GHz. The quantum dots are coupled coherently, absorbing microwave photons and acoustic phonons.