Distinct Signatures For Coulomb Blockade and Aharonov-Bohm Interference in Electronic Fabry-Perot Interferometers

TL;DR

This paper identifies and distinguishes two types of magnetoresistance oscillations in electronic Fabry-Perot interferometers, attributing them to Coulomb blockade and Aharonov-Bohm effects, and demonstrates control over these phenomena.

Contribution

It provides clear signatures to differentiate Coulomb blockade from Aharonov-Bohm oscillations in Fabry-Perot interferometers of different sizes.

Findings

Oscillations in 2.0 μm² device are due to Coulomb blockade.

Oscillations in 18 μm² device are due to Aharonov-Bohm effect.

Distinct signatures allow for control and understanding of these mechanisms.

Abstract

Two distinct types of magnetoresistance oscillations are observed in two electronic Fabry-Perot interferometers of different sizes in the integer quantum Hall regime. Measuring these oscillations as a function of magnetic field and gate voltages, we observe three signatures that distinguish the two types. The oscillations observed in a 2.0 square micron device are understood to arise from the Coulomb blockade mechanism, and those observed in an 18 square micron device from the Aharonov-Bohm mechanism. This work clarifies, provides ways to distinguish, and demonstrates control over, these distinct physical origins of resistance oscillations seen in electronic Fabry-Perot interferometers.