Coulomb blockade double-dot Aharonov-Bohm interferometer: giant fluctuations

TL;DR

This paper investigates electron transport in a double quantum dot system, revealing that Coulomb interactions and quantum coherence lead to giant current fluctuations and divergent noise characteristics.

Contribution

It introduces the phenomenon of giant current fluctuations caused by Coulomb correlation and quantum coherence in double-dot Aharonov-Bohm interferometers, with a physical interpretation.

Findings

Strong current fluctuations with divergent Fano factor at zero frequency

Physical explanation for giant noise fluctuations

Applicability to more complex systems

Abstract

Electron transport through two parallel quantum dots is a kind of solid-state realization of double-path interference. We demonstrate that the inter-dot Coulomb correlation and quantum coherence would result in strong current fluctuations with a divergent Fano factor at zero frequency. We also provide physical interpretation for this surprising result, which displays its generic feature and allows us to recover this phenomenon in more complicated systems.