Key points are not available for this paper at this time.
Via a novel interference experiment, which measures magnitude and phase of the transmission coefficient through a quantum dot in the Coulomb regime, we prove directly, for the first time, that transport through the dot has a coherent component. We find the same phase of the transmission coefficient at successive Coulomb peaks, each representing a different number of electrons in the dot; however, as we scan through a single Coulomb peak we find an abrupt phase change of. The observed behavior of the phase cannot be understood in the single particle framework.
Yacoby et al. (Mon,) studied this question.