Observation of the logarithmic dispersion of high frequency edge excitations

TL;DR

This study presents phase-sensitive microwave measurements revealing the logarithmic dispersion relation of edge magneto-plasmons in a high mobility 2D electron gas under magnetic field, across various wave vectors and frequencies.

Contribution

It provides the first detailed observation of the logarithmic dispersion of edge excitations using phase-sensitive microwave techniques in a 2D electron system.

Findings

Logarithmic dispersion of edge magneto-plasmons observed.

Spectrum studied over broad frequency range.

Edge excitations characterized by specific wave vector configurations.

Abstract

We report phase sensitive measurements of microwave propagation through a high mobility two dimensional electron gas subjected to a perpendicular magnetic field. Two types of configurations were used, one that allows all wave vectors q, and one that selects only specific q values. The spectrum of edge excitations was studied over a broad frequency span, which allowed us to observe the logarithmic dispersion of edge magneto-plasmons.