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

doi:10.1063/1.2357605

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 journal › Article › peer-review

19 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 _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.

Original language	English (US)
Article number	132109
Journal	Applied Physics Letters
Volume	89
Issue number	13
DOIs	https://doi.org/10.1063/1.2357605
State	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2357605

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title = "Terahertz transmission characteristics of high-mobility GaAs and InAs two-dimensional-electron-gas systems",

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 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.",

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

note = "Funding Information: The work at Buffalo is supported by the Department of Energy and NYSTAR. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy{\textquoteright}s National Nuclear Security Administration under Contract No. DE-AC04-94AL85000. ",

year = "2006",

doi = "10.1063/1.2357605",

language = "English (US)",

volume = "89",

journal = "Applied Physics Letters",

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publisher = "American Institute of Physics Publising LLC",

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T1 - Terahertz transmission characteristics of high-mobility GaAs and InAs two-dimensional-electron-gas systems

AU - Kabir, N. A.

AU - Yoon, Y.

AU - Knab, J. R.

AU - Chen, J. Y.

AU - Markelz, A. G.

AU - Reno, J. L.

AU - Sadofyev, Y.

AU - Johnson, Shane

AU - Zhang, Yong-Hang

AU - Bird, J. P.

N1 - Funding Information: The work at Buffalo is supported by the Department of Energy and NYSTAR. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under Contract No. DE-AC04-94AL85000.

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

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

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