Observation of inter-edge magnetoplasmon mode in a degenerate two-dimensional electron gas

TL;DR

This paper reports the experimental observation of inter-edge magnetoplasmon modes in a two-dimensional electron gas within the quantum Hall regime, revealing insights into edge state dynamics and structure.

Contribution

It provides the first direct measurement of inter-edge magnetoplasmon modes and analyzes their propagation velocities to infer edge structure parameters.

Findings

Detection of two decoupled edge and inter-edge magnetoplasmon modes

Measurement of propagation velocities of these modes

Derivation of edge structure parameters from velocity analysis

Abstract

We study the propagation of edge magnetoplasmons by time-resolved current measurements in a sample which allows for selective detection of edge states in the quantum Hall regime. We observe two decoupled modes of edge and inter-edge magnetoplasmons at filling factors close to 3. From the analysis of the propagation velocities of each mode the internal spatial parameters of the edge structure are derived.