Phys. Rev. Lett. 74, 4047–4050 (1995)Coherence and Phase Sensitive Measurements in a Quantum DotReceived 10 November 1994; published in the issue dated 15 May 1995 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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.4047
DOI:
10.1103/PhysRevLett.74.4047
PACS:
73.20.Dx, 71.45.-d, 72.80.Ey, 73.40.Gk
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