Electronic interferometer capacitively coupled to a quantum dot

TL;DR

This paper theoretically investigates how a quantum dot influences electron interference in a ballistic interferometer, revealing that charge degeneracy in the dot reduces interference visibility, aligning with recent experimental findings.

Contribution

It introduces a theoretical model analyzing the impact of a capacitively coupled quantum dot on electron interference visibility in a ballistic interferometer.

Findings

Interference visibility decreases with charge degeneracy in the quantum dot.

The reduction depends on the capacitive coupling strength.

Results align with recent experimental observations.

Abstract

We theoretically study electron interference in a ballistic electronic interferometer capacitively coupled to a quantum dot. The visibility of the interference is reduced when the dot has degenerate ground states with different excess charges. The degree of the reduction depends on system parameters such as the strength of the capacitive coupling, and the dependence is analyzed in the regime where the dwell time of electrons in the dot is much longer than the electron flight time through the interferometry region coupled to the dot. The result is consistent with recent experimental data.