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

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, particular...

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Published in:Applied physics letters 2006-09, Vol.89 (13), p.132109-132109-3
Main Authors: Kabir, N. A., Yoon, Y., Knab, J. R., Chen, J.-Y., Markelz, A. G., Reno, J. L., Sadofyev, Y., Johnson, S., Zhang, Y.-H., Bird, J. P.
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Summary: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 t ∕ τ q , 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2357605