Mesoscopic to universal crossover of the transmission phase of multilevel quantum dots |
| |
Authors: | Karrasch C Hecht T Weichselbaum A Oreg Y von Delft J Meden V |
| |
Institution: | Institut für Theoretische Physik, Universit?t G?ttingen, 37077 G?ttingen, Germany. |
| |
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 multilevel 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: | |
本文献已被 PubMed 等数据库收录! |
|