Azbel'-Kaner-Like Cyclotron Resonance in a Two-Dimensional Electron System

TL;DR

This paper reports the observation of a cyclotron resonance mode in a two-dimensional electron system that behaves like the Azbel'-Kaner resonance, localized at the edge and distinct from collective plasma modes.

Contribution

It demonstrates a single-particle Azbel'-Kaner-like cyclotron resonance in a 2D electron system, distinct from collective modes and localized at the electrode edge.

Findings

Resonance follows the cyclotron resonance position

No collective plasma depolarization shift observed

Resonance localized at the electrode edge

Abstract

Resonant microwave absorption of a two-dimensional electron system in an AlGaAs/GaAs heterostructure excited by a near-field technique was investigated. Along with collective magnetoplasmon modes, we observed resonance that precisely follows the cyclotron resonance (CR) position and revealed no signs of collective plasma depolarization shift. We show that the discovered CR mode is absent in the Faraday geometry, and is localized at the edge of the exciting metal electrode. Such behavior points in favor of the single-particle Azbel'-Kaner nature of the discovered resonance.