Time-Resolved Detection of Individual Electrons in a Quantum Dot
R. Schleser, E. Ruh, T. Ihn, K. Ensslin, D. C. Driscoll, A. C. Gossard
Abstract
We present measurements on a quantum dot and a nearby, capacitively coupled, quantum point contact used as a charge detector. With the dot being weakly coupled to only a single reservoir, the transfer of individual electrons onto and off the dot can be observed in real time in the current signal from the quantum point contact. From these time-dependent traces, the quantum mechanical coupling between dot and reservoir can be extracted quantitatively. A similar analysis allows the determination of the occupation probability of the dot states.
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