Gate tunable edge magnetoplasmon resonators

TL;DR

This paper presents a tunable edge magnetoplasmon resonator based on quantum Hall systems, controllable via magnetic fields and electrostatic gates, enabling future interferometric applications and studies of non-abelian anyons.

Contribution

It introduces a novel, tunable radiofrequency resonator platform with gate-controlled frequency response for quantum Hall edge states.

Findings

Resonance frequency is tunable by magnetic field and electrostatic gates.

Continuous control of the frequency response enables interferometric device development.

Finite size effects are observed at smaller resonator sizes, explained theoretically.

Abstract

Quantum Hall systems are platforms of choice when it comes to study topological properties of condensed matter systems and anyonic exchange statistics. In this work we have developed a tunable radiofrequency edge magnetoplasmonic resonator meant to serve as a versatile platform for future interferometric devices. The resonance frequency of the system is controlled by both the magnetic field and a set of electrostatic gates. The gates allow us to change both the size of the resonant cavity and the electronic density of the two-dimensional electron gas. We show that we can continuously control the frequency response of our resonator, making it possible to develop an edge magnetoplasmon interferometer. As we reach smaller sizes of our resonator, finite size effects caused by the measurement probes manifest. We present a theoretical description of the system taking into account the spatial extension of the probing gates. In the future, such device will be a valuable tool to investigate the properties of non-abelian anyons in the fractional quantum Hall regime.