Coulomb interaction-induced Aharonov-Bohm oscillations

TL;DR

This paper investigates how Coulomb interactions can induce Aharonov-Bohm oscillations in a remote quantum dot system, revealing conditions under which these oscillations become highly visible despite weak original signals.

Contribution

It demonstrates that Coulomb interactions can induce and enhance AB oscillations in a remote quantum dot, especially near the particle-hole symmetric point, expanding understanding of quantum interference effects.

Findings

Coulomb interaction induces AB oscillations characterized by charge susceptibility.

High visibility of induced AB oscillations occurs near particle-hole symmetry.

Induced AB oscillations can be prominent even when original AB signals are weak.

Abstract

We study the Coulomb interaction-induced Aharonov-Bohm (AB) oscillations in the linear response transport through a remote quantum dot which has no tunnel coupling but has Coulomb coupling with the quantum dot embedded in an AB interferometer. We show that the Coulomb interaction-induced AB effect is characterized by a charge susceptibility of a remote quantum dot in a weak interaction regime. In a strong but finite interaction regime, around the particle-hole symmetric point, there exists the region where the visibility of the induced AB oscillations becomes one although the visibility of the original AB oscillations in the interferometer is low.