Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Quantum dots: Optical and transport properties

HL 39.12: Talk

Thursday, March 26, 2009, 12:45–13:00, BEY 81

Noninvasive detection of molecular bonds in quantum dots — •Maximilian C. Rogge and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

We performed charge detection on a lateral triple quantum dot with starlike geometry. The setup allows us to interpret the results in terms of two double quantum dots with one common quantum dot. One double dot features weak tunnel coupling and can be understood with atomlike electronic states, the other one is strongly coupled forming moleculelike states. In nonlinear measurements we identified patterns that can be analyzed in terms of the symmetry of tunneling rates. Those patterns strongly depend on the strength of interdot tunnel coupling and are completely different for atomlike or moleculelike coupled quantum dots allowing the noninvasive detection of molecular bonds.

M. C. Rogge and R. J. Haug, Phys. Rev. B 78, 153310 (2008)
M. C. Rogge and R. J. Haug, Phys. Rev. B 77, 193306 (2008)