Transmission phase of a singly occupied quantum dot in the Kondo regime
Abstract
We report on the phase measurements on a quantum dot containing a single electron in the Kondo regime. Transport takes place through a single orbital state. Although the conductance is far from the unitary limit, we measure for the first time, a transmission phase as theoretically predicted of \pi/2. As the dot's coupling to the leads is decreased, with the dot entering the Coulomb blockade regime, the phase reaches a value of \pi. Temperature shows little effect on the phase behaviour in the range 30--600 mK, even though both the two-terminal conductance and amplitude of the Aharonov-Bohm oscillations are strongly affected. These results confirm that previous phase measurements involved transport through more than a single level.
Keywords
Cite
@article{arxiv.0711.1172,
title = {Transmission phase of a singly occupied quantum dot in the Kondo regime},
author = {M. Zaffalon and Aveek Bid and M. Heiblum and D. Mahalu and V. Umansky},
journal= {arXiv preprint arXiv:0711.1172},
year = {2009}
}
Comments
4 pages, 5 figures