Mesoscopic to universal crossover of transmission phase of multi-level quantum dots
Mesoscale and Nanoscale Physics
2007-11-07 v3 Strongly Correlated Electrons
Abstract
Transmission phase \alpha measurements of many-electron quantum dots (small mean level spacing \delta) revealed universal phase lapses by \pi between consecutive resonances. In contrast, for dots with only a few electrons (large \delta), the appearance or not of a phase lapse depends on the dot parameters. We show that a model of a multi-level quantum dot with local Coulomb interactions and arbitrary level-lead couplings reproduces the generic features of the observed behavior. The universal behavior of \alpha for small \delta follows from Fano-type antiresonances of the renormalized single-particle levels.
Keywords
Cite
@article{arxiv.cond-mat/0609191,
title = {Mesoscopic to universal crossover of transmission phase of multi-level quantum dots},
author = {C. Karrasch and T. Hecht and A. Weichselbaum and Y. Oreg and J. von Delft and V. Meden},
journal= {arXiv preprint arXiv:cond-mat/0609191},
year = {2007}
}
Comments
4 pages, version accepted for publication in PRL