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Resonant-energy relaxation of terahertz-driven two-dimensional electron gases

N. G. Asmar, A. G. Markelz, E. G. Gwinn, J. Černe, M. S. Sherwin, K. L. Campman, P. F. Hopkins, and A. C. Gossard
Phys. Rev. B 51, 18041(R) – Published 15 June 1995
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Abstract

We present experimental studies of energy loss from quasi-two-dimensional electron gases that are driven to a nonequilibrium steady state by intense, ultrahigh-frequency fields. For the AlxGa1xAs/GaAs heterostructures studied, longitudinal-optical (LO) phonon emission dominates energy loss across the previously unexplored frequency range from 0.2 to 3.5 THz, at moderate electron temperatures. We find an unexpected resonance in the absorbed power that is consistent with an increase near 0.5 THz in either the net LO phonon emission rate, or in the high-frequency mobility.

  • Received 28 April 1995

DOI:https://doi.org/10.1103/PhysRevB.51.18041

©1995 American Physical Society

Authors & Affiliations

N. G. Asmar, A. G. Markelz, E. G. Gwinn, J. Černe, and M. S. Sherwin

  • Department of Physics, University of California, Santa Barbara, California 93106

K. L. Campman, P. F. Hopkins, and A. C. Gossard

  • Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106

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Vol. 51, Iss. 24 — 15 June 1995

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