Terahertz transmission characteristics of high-mobility GaAs and InAs two-dimensional-electron-gas systems

N. A. Kabir, Y. Yoon, J. R. Knab, J. Y. Chen, A. G. Markelz, J. L. Reno, Y. Sadofyev, Shane Johnson, Yong-Hang Zhang, J. P. Bird

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Frequency-dependent complex conductivity of high-mobility GaAs and InAs two-dimensional-electron-gas (2DEG) systems is studied by terahertz time domain spectroscopy. Determining the momentum relaxation time from a Drude model, the authors find a lower value than that from dc measurements, particularly at high frequencies/low temperatures. These deviations are consistent with the ratio τ tq, where τ q is the full scattering time. This suggests that small-angle scattering leads to weaker heating of 2DEGs at low temperatures than expected from dc mobility.

Original languageEnglish (US)
Article number132109
JournalApplied Physics Letters
Volume89
Issue number13
DOIs
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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