Nonlinear optical properties of type-II quantum wells

G. R. Olbright, W. S. Fu, J. F. Klem, H. M. Gibbs, G. Khitrova, R. Pon, B. Fluegel, K. Meissner, N. Peyghambarian, R. Binder, I. Galbraith, S. W. Koch

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Experimental and theoretical investigations of the near-band-gap optical nonlinearities in type-II GaAs/AlAs quantum wells are reported. The temporal evolution of the optical nonlinearities of different samples grown at our two different laboratories is analyzed by comparing femtosecond results at different pump-probe time delays with nanosecond measurements at different sample temperatures. The quasi-cw measurements at low temperatures show exciton bleaching and a pronounced heavy-hole exciton blueshift, which is absent at elevated plasma temperatures (100 K). Femtosecond spectra show a delayed onset of the exciton blueshift consistent with hole-plasma cooling in the absence of electrons. The results are analyzed using many-body theory assuming complete electron-hole charge separation. We show that the presence of a one-component plasma modifies the nonlinear optical behavior of the GaAs layer and results in dramatically different properties compared to type-I quantum-well structures.

Original languageEnglish (US)
Pages (from-to)3043-3053
Number of pages11
JournalPhysical Review B
Issue number7
StatePublished - 1991

ASJC Scopus subject areas

  • Condensed Matter Physics


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