| speaker: | Klaus Ensslin ETH Zürich, Switzerland |
| time: | Th., 23.08, 10:30-11:20 |
collaborators: R. Leturcq, S. Gustavsson, M. Sigrist, T. Ihn
The Kondo effect can be analyzed in great detail in tunable quantum dots. Using a quantum ring with three terminals we are able to tune the tunnel coupling of each lead by adding magnetic flux through the lead. This way the Kondo density of states in the ring can be investigated by passing current through a lead without Kondo correlations to the ring electrons, while the other leads are more strongly coupled to the dot giving rise to a Kondo effect. In another experiment a ring geometry containing two quantum dots is investigated. By tuning the quantum dots to the Coulomb blockade regime we explore electron coherence where transport is dominated by inelastic tunneling processes. Finally we use a charge detector close to one of the dots to detect coherence in the ring geometry in a time-resolved way.