Coulomb-interaction effects in full counting statistics of a quantum-dot Aharonov-Bohm interferometer

TL;DR

This paper investigates how Coulomb interactions influence the full counting statistics in a quantum-dot Aharonov-Bohm interferometer, revealing significant changes in interference processes and statistical behavior under different interaction regimes.

Contribution

It provides a detailed analysis of Coulomb interaction effects on quantum interference and counting statistics in a quantum-dot AB interferometer, highlighting the transition from nonresonant to resonant processes.

Findings

Coulomb interaction alters the interference process statistics.

Resonant processes with odd flux dependence emerge at large charging energy.

Strong asymmetry in tunnel couplings leads to super-Poissonian statistics.

Abstract

We study the effect of Coulomb interaction on the full counting statistics of an Aharonov-Bohm (AB) interferometer with a single-level quantum dot in one arm in the regime of weak dot-lead and lead-lead tunnel couplings. In the absence of Coulomb interaction, the interference processes are of nonresonant nature with an even AB flux dependence and obey bidirectional Poissonian statistics. For large charging energy, the statistic of these processes changes. In addition, processes of resonant nature with an odd flux dependence appear. In the limit of strongly asymmetric tunnel couplings from the dot to the left and right leads, their statistics is found to be strongly super-Poissonian.