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Phys. Rev. B 66, 205301 (2002) [6 pages]

Photothermal transitions of magnetoexcitons in GaAs/AlxGa1-xAs quantum wells

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J. Černe1, J. Kono2, M. Su3, and M. S. Sherwin4
1Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260
2Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005
3National Institute of Standards and Technology 815.04, 325 Broadway, Boulder, Colorado 80305
4Department of Physics and Center for Terahertz Science and Technology, University of California, Santa Barbara, California 93106

Received 13 June 2002; published 1 November 2002

By monitoring changes in excitonic photoluminescence (PL) that are induced by terahertz (THz) radiation, we observe resonant THz absorption by magnetoexcitons in GaAs/AlxGa1-xAs quantum wells. Changes in the PL spectrum are explored as a function of temperature and magnetic field, providing insight into the mechanisms which allow THz absorption to modulate PL. The strongest PL-quenching occurs at the heavy hole 1s⃗2p+ resonance where heavy hole excitons are photothermally converted into light hole excitons.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.205301
DOI:
10.1103/PhysRevB.66.205301
PACS:
78.66.-w, 78.30.Fs, 71.35.Ji
 
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