Resistively detected high-order magnetoplasmons in a high-quality 2D electron gas

TL;DR

This study detects high-order magnetoplasmon resonances in high-mobility GaAs quantum wells via photoresistance, revealing a series of extrema with alternating strength up to order 20, offering a new method to explore collective excitations.

Contribution

The paper introduces a sensitive photoresistance technique to detect and analyze high-order magnetoplasmon modes in 2D electron gases, extending understanding of collective excitations.

Findings

Detection of magnetoplasmon resonances up to order 20

Alternating strength of extrema at even and odd modes

Potential application to other 2D systems

Abstract

We report on high-order magnetoplasmon resonances detected in photoresistance in high-mobility GaAs quantum wells. These resonances manifest themselves as a series of photoresistance extrema in the regime of Shubnikov-de Haas oscillations. Extending to orders above 20, the extrema exhibit alternating strength, being less (more) pronounced at even (odd) order magnetoplasmon modes. This experimental technique provides sensitive and elegant means to detect and investigate multiple magnetoplasmon modes and could be applied to other systems.