Comment on "Do Intradot Electron-Electron Interactions Induce Dephasing?"

TL;DR

This paper critiques a recent study on quantum dot transport, arguing that its conclusions about the absence of dephasing due to intradot interactions are flawed due to analytical inconsistencies.

Contribution

It provides a critical analysis highlighting errors in the previous work's methodology and conclusions regarding dephasing in quantum dot systems.

Findings

Identifies inconsistencies in the analysis by Jiang et al.

Argues that their conclusions about dephasing are not supported.

Highlights the importance of correct theoretical modeling in quantum transport.

Abstract

In a recent Letter, Jiang, Sun, Xie and Wang [Phys. Rev. Lett. 93, 076802 (2004), cond-mat/0408261] study transport through an interacting quantum dot embedded in one arm of an Aharonov-Bohm interferometer. Based on a theoretical analysis of the Aharonov-Bohm oscillation amplitude, Jiang {\it et al.} claim, contrary to earlier work by two of us, that at finite temperature the intradot interaction will {\em not} lead to any dephasing. Likewise, they claim that the theoretically predicted and experimentally verified asymmetry of the Aharonov-Bohm oscillation amplitude is {\em not} associated with dephasing. In this Comment, we point out severe inconsistencies in the analysis of the Letter by Jian {\it et al.}, and show that their conclusions are ill-founded.