Mercredi 23 mai 2012 à 14h15
Salle 234, Ecole de Physique

Towards a n-electron coherent source based on Lorentzian voltage pulses

Julie Dubois, CEA Saclay

Injecting a controlled number of electrons in a quantum ballistic conductor opens the way to new kind of quantum experiments, yet never done. A DC voltage biased contact applied on a single mode quantum conductor, such as a quantum point contact, injects continuously single electrons at a rate $ au=eV/h$. Here we consider the injection of electrons during a very short time where it is expected that a voltage pulse with integer flux $int eV(t)dt/h=N$ injects exactly $N$ quanta of charge. However for most of the voltage pulses $V(t)$, this charge corresponds to the excitation of $N$ electrons plus an excess of quasi-particles (holes and electrons) of which total charge is neutral.