Abstract
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 π. The observed behavior of the phase cannot be understood in the single particle framework.
- Received 10 November 1994
DOI:https://doi.org/10.1103/PhysRevLett.74.4047
©1995 American Physical Society