Transmission Phase of a Quantum Dot with Kondo Correlation Near the Unitary Limit
Abstract
The complex transmission amplitude -- both magnitude and phase -- of a quantum dot (QD) with Kondo correlation was measured near the unitary limit. Contrary to previous phase measurements, performed far from this limit [Ji et al., Science 290, 779 (2000)], the transmission phase was observed to evolve linearly over a range of about 1.5 pi when the Fermi energy was scanned through a Kondo pair -- a pair of spin degenerate energy levels. Moreover, the phase in Coulomb blockade (CB) peak, adjancent to the Kondo pair, retained a memory of the Kondo correlation and did not exhibit the familiar behavior in the CB regime. These results do not agree with theoretical predictions, suggesting that a full explanation may go beyond the framework of the Anderson model.
Keywords
Cite
@article{arxiv.cond-mat/0106469,
title = {Transmission Phase of a Quantum Dot with Kondo Correlation Near the Unitary Limit},
author = {Yang Ji and M. Heiblum and Hadas Shtrikman},
journal= {arXiv preprint arXiv:cond-mat/0106469},
year = {2009}
}
Comments
4 pages, 4 figures