Abstract
Transmission phase measurements of many-electron quantum dots (small mean level spacing ) revealed universal phase lapses by between consecutive resonances. In contrast, for dots with only a few electrons (large ), the appearance or not of a phase lapse depends on the dot parameters. We show that a model of a multilevel quantum dot with local Coulomb interactions and arbitrary level-lead couplings reproduces the generic features of the observed behavior. The universal behavior of for small follows from Fano-type antiresonances of the renormalized single-particle levels.
- Received 8 September 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.186802
©2007 American Physical Society