Download Time-resolved electron transport through quantum dots

Time-resolved electron transport through quantum dots
Klaus Ensslin, ETH Zurich
Single electron transport and the phenomenon of Coulomb blockade in quantum dots
have been used to investigate semiconductor quantum structures. A quantum point
contact serves as a charge sensor which can operate even when traditional transport
experiments through the dot fail because currents fall below experimentally
detectable levels. In addition the quantum point contact detector can be used to
measure electron transport through the dot in a time-resolved fashion. This way shot
noise and higher order correlations of electrons transport can be measured. We also
show that the detector may emit photons and/or phonons, depending on the
experimental conditions, which influence the quantum dot to be measured. The
concept of coupled quantum systems is extended to graphene devices. By using two
detectors it becomes possible to perform correlation and anti-correlation experiments
which give access to the details of electron transport in double dot systems.