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

E. A. Shaner, S. A. Lyon

cond-mat.mtrl-sciarXiv:cond-mat/0204229

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 (3He) 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.

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