APS » PROLA » Phys. Rev. B » Volume 64 » Issue 24

Phys. Rev. B 64, 241302 (2001) [4 pages]

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

Download: PDF (365 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

H. Qin1, A. W. Holleitner1, K. Eberl2, and R. H. Blick1
1Center for NanoScience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
2Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany

Rapid Communication Received 11 July 2001; published 12 November 2001

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.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e241302
DOI: 10.1103/PhysRevB.64.241302
PACS: 73.23.Hk, 03.67.Lx, 85.35.Be

[ Abstract  |  Previous article  |  Next article  |  Issue 24 ]