Time-resolved impulse response of the magnetoplasmon resonance in a two-dimensional electron gas

TL;DR

This study measures the magnetoplasmon resonance in a two-dimensional electron gas using ultrashort optical pulses and time-resolved pump-probe techniques, achieving frequencies up to 200 GHz.

Contribution

It introduces a novel method for time-resolved measurement of magnetoplasmon resonance in 2D electron gases at very high frequencies.

Findings

Resonant frequencies match the magnetoplasmon dispersion relation.

Successful detection of resonance using a guided wave probe.

Frequency measurements extend up to 200 GHz.

Abstract

We have used optically excited ultrashort electrical pulses to measure the magnetoplasmon resonance of a two-dimensional electron gas formed in an AlGaAs/GaAs heterostructure at frequencies up to 200 gigahertz. This is accomplished by incorporating the sample into a guided wave probe operating in a pumped (^{3}He) system. We are able to detect the resonance by launching a stimulus pulse in the guide, and monitoring the system response in a time resolved pump-probe arrangement. Data obtained from measurements yield resonant frequencies that agree with the magnetoplasmon dispersion relation.