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Time-resolved single electron detection in quantum dot structures

Prof. Thomas Ihn
Solid State Physics Laboratory, ETH Z├╝rich

 

Quantum dots in the Coulomb blockade regime allow to manipulate individual electrons and to tailor their quantum states. In recent experiments we have exploited the possibility to observe the time-resolved occupation of quantum dot states for measurements of sub-attoampere currents, shot-noise of these low currents, and higher order moments of the current noise. In addition, the technique allows the observation of the self-interference of single electrons in an Aharonov-Bohm type experiment and the detection of single photons in a double quantum dot. While these measurements require a very high quality material system like Ga[Al]As, both, the Coulomb blockade effect and charge detection, are robust enough to be observed even in graphene, a material which is much less mature. First results will be shown on the conductance and charge detection in graphene quantum dots.