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APS » Journals » Phys. Rev. Lett. » Volume 77 » Issue 6
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Phys. Rev. Lett. 77, 1131–1134 (1996)

Terahertz Dynamics of Excitons in GaAs/AlGaAs Quantum Wells

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J. Černe1, J. Kono2, M. S. Sherwin1, M. Sundaram3, A. C. Gossard3, and G. E. W. Bauer4
1Department of Physics and Center for Free-Electron Laser Studies, University of California, Santa Barbara, California 93106
2Quantum Transition Project, Research Development Corporation of Japan, Tokyo 153, Japan
3Materials Department, University of California, Santa Barbara, California 93106
4Department of Applied Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

Received 14 February 1996; published in the issue dated 5 August 1996

By monitoring changes in excitonic photoluminescence that are induced by far-infrared (FIR) radiation, we observed resonant FIR absorption by magnetoexcitons in GaAs/AlGaAs quantum wells. The dominant resonance is assigned to the 1s→2p+ transition of the heavy-hole exciton, and agrees well with theory. At low FIR and interband excitation intensities, the 1s→2p+ absorption feature is very narrow and broadens as either of these intensities is increased. The 1s→2p+ absorption feature persists even when the FIR electric field is comparable to the electric field which binds the exciton.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.1131
DOI:
10.1103/PhysRevLett.77.1131
PACS:
73.20.Dx, 71.35.Ji, 78.66.Fd
 
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