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TT: Tiefe Temperaturen

TT 16: Korrelierte Elektronen: Quantenstörstellen, Kondo-Physik

TT 16.6: Talk

Tuesday, March 9, 2004, 18:00–18:15, H19

Optical fingerprints of Kondo-correlations — •Rolf Helmes, Michael Sindel, Laszlo Borda, and Jan von Delft — Sektion Physik und CeNS, LMU, Theresienstr. 37, 80333 Muenchen

We calculate the recombination spectra of trapped excitons in self-assembled, optically excited, charge-tunable quantum dots of the type recently investigated experimentally by R. J. Warburton et al. (Nature 405, 926). If the experimental situation is such that the initial state decays via exciton recombination into a final state which is a Kondo-state with strong correlations between the electrons in the dot and those in the semiconductor, the Kondo-effect should be visible in the recombination spectrum. We use Wilson’s numerical renormalization group method to calculate this spectrum. Depending on the numbers of electrons in the charge-tunable quantum dot, we find an unusual dip in the Kondo-peak of the spectrum.