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APS » Journals » Phys. Rev. B » Volume 51 » Issue 24
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Phys. Rev. B 51, 18041–18044 (1995)

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

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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

Received 28 April 1995; published in the issue dated 15 June 1995

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 AlxGa1-xAs/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.

© 1995 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.51.18041
DOI:
10.1103/PhysRevB.51.18041
PACS:
72.30.+q, 72.20.Ht, 73.50.Fq
 
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