Transmission Phase Through Two Quantum Dots Embedded in a Four-Terminal Quantum Ring

TL;DR

This study measures the transmission phase through two quantum dots in a four-terminal quantum ring using the Aharonov-Bohm effect, allowing independent control of electron numbers in each dot.

Contribution

It introduces a method to measure and control the transmission phase through two quantum dots embedded in a quantum ring, advancing understanding of quantum interference effects.

Findings

Transmission phase varies with electron number in each quantum dot.

Independent control of electron numbers in two dots is achieved.

Aharonov-Bohm effect is used to measure phase differences.

Abstract

We use the Aharonov-Bohm effect in a four-terminal ring based on a Ga[Al]As heterostructure for the measurement of the relative transmission phase. In each of the two interfering paths we induce a quantum dot. The number of electrons in the two dots can be controlled independently. The transmission phase is measured as electrons are added to or taken away from the individual quantum dots.