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Proceedings Paper

Anomalies in the resonant magnetopolaron region for confined impurities in multiple quantum-well structures
Author(s): Jiping Cheng; Bruce D. McCombe; G. Brozak; John D. Ralston; Gary W. Wicks
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Paper Abstract

Far infrared photothermal ionization spectroscopy of well-center doped shallow donors in GaAs/AlCaAs'multiple-quantum-well structures has been carried out to investigate the electron - optical-phonon interaction. The ls-2p(m=+1) and ls-3p(m=-i-1). transitions are tuned through the resonant region with the GaAs optical phonons by magnetic fields up to 23 .5T . Both two -level and three -level resonance measurements show similar anti-level-crossing behavior with extremely large interaction gaps. The lower branches are well below (-50 cm ) the resonant energies involving the bulk zone centr LO phonons. These anomalous features strongly suggest that electrons in the wells interact with phonon modes at several different frequencies, or a phonon band, in contrast to the single frequency LO phonons in the bulk. A partial explanation may be found in terms of electron - interface-phonon and electron - confined-LO-phonon interactions. Other possible mechanisms are also discussed.

Paper Details

Date Published: 1 October 1990
PDF: 12 pages
Proc. SPIE 1283, Quantum Well and Superlattice Physics III, (1 October 1990); doi: 10.1117/12.20753
Show Author Affiliations
Jiping Cheng, SUNY/Buffalo (United States)
Bruce D. McCombe, SUNY/Buffalo (United States)
G. Brozak, Northeastern Univ. (United States)
John D. Ralston, Cornell Univ. (United States)
Gary W. Wicks, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 1283:
Quantum Well and Superlattice Physics III
Gottfried H. Doehler; Emil S. Koteles; Joel N. Schulman, Editor(s)

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