Photovoltage Detection of Edge Magnetoplasmon Oscillations and Giant Magnetoplasmon Resonances in A Two-Dimensional Hole System

TL;DR

This study reports the detection of edge magnetoplasmon oscillations and giant magnetoplasmon resonances in a high-mobility two-dimensional hole system using photovoltage measurements, revealing novel oscillatory behavior and strong resonance signals.

Contribution

It introduces a new method of detecting edge magnetoplasmon oscillations and giant magnetoplasmon resonances in 2D hole systems via photovoltage, expanding understanding of plasmonic phenomena in such materials.

Findings

B-periodic oscillations induced by microwaves in photovoltage measurements.

Oscillation period inversely proportional to microwave frequency.

Weak damping of EMP oscillations at high magnetic fields.

Abstract

In our high mobility p-type AlGaAs/GaAs two-dimensional hole samples, we originally observe the B-periodic oscillation induced by microwave (MW) in photovoltage (PV) measurements. In the frequency range of our measurements (5 - 40 GHz), the period ({\Delta}B) is inversely proportional to the microwave frequency (f). The distinct oscillations come from the edge magnetoplasmon (EMP) in the high quality heavy hole system. In our hole sample with a very large effective mass, the observation of the EMP oscillations is in neither the low frequency limit nor the high frequency limit, and the damping of the EMP oscillations is very weak under high magnetic fields. Simultaneously, we observe the giant plasmon resonance signals in our measurements on the shallow two-dimensional hole system (2DHS).