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Terahertz time-domain magnetospectroscopy of a high-mobility two-dimensional electron gas.

Authors
Type
Published Article
Journal
Optics letters
Publication Date
Volume
32
Issue
13
Pages
1845–1847
Identifiers
PMID: 17603589
Source
Medline
License
Unknown

Abstract

We have observed cyclotron resonance in a high-mobility GaAs/AlGaAs two-dimensional electron gas by using the techniques of terahertz time-domain spectroscopy combined with magnetic fields. From this, we calculate the real and imaginary parts of the diagonal elements of the magnetoconductivity tensor, which in turn allows us to extract the concentration, effective mass, and scattering time of the electrons in the sample. We demonstrate the utility of ultrafast terahertz spectroscopy, which can recover the true linewidth of cyclotron resonance in a high-mobility (>10(6) cm(2)V(-1)s(-1)) sample without being affected by the saturation effect.

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