Do intradot electron-electron interactions induce dephasing?

TL;DR

This study shows that intradot electron-electron interactions in a quantum dot do not cause dephasing, and electron transport remains fully coherent, challenging previous assumptions about dephasing mechanisms.

Contribution

It demonstrates that intradot electron-electron interactions do not induce dephasing in quantum dot transport, using an open multi-terminal Aharonov-Bohm setup.

Findings

Intradot interactions do not cause dephasing.

Transport remains fully coherent despite interactions.

Asymmetric AB oscillation amplitude is due to structure, not dephasing.

Abstract

We investigate the degree of coherence of electronic transport through a quantum dot (QD) in the presence of an intradot electron-electron interaction. By using an open multi-terminal Aharonov-Bohm (AB) setup, we find that the intradot interaction does not induce any dephasing effect and the electron transport through the QD is fully coherent. We also observe that the asymmetric amplitude of the AB oscillation in the conductance through the two-terminal AB setup originates from the interplay between the confined structure and the electron-electron interaction. Thus, one can not associate a dephasing process with this asymmetric amplitude, as has been done in previous studies.