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Optical Characterization of Ultra-Thin InAs Strain-Layer Quantum Wells Grown on (511) GaAs Substrate

Published online by Cambridge University Press:  21 February 2011

Weimin Zhou
Affiliation:
US Army Research Laboratory, EPSD, Ft. Monmouth, NJ 07703
H. Shen
Affiliation:
US Army Research Laboratory, EPSD, Ft. Monmouth, NJ 07703 Geo-centers Inc., Lake Hopatcong, NJ 07849
M.W. Cole
Affiliation:
US Army Research Laboratory, EPSD, Ft. Monmouth, NJ 07703
D. Miller
Affiliation:
Pennsylvania State University, PA 16802
M. Dutta
Affiliation:
US Army Research Laboratory, EPSD, Ft. Monmouth, NJ 07703
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Abstract

Absorption, photoluminescence, photoreflectance and transmission electron microscopy measurements have been performed on 2 and 3-monolayer thin InAs quantum wells(QW) (with 250Å wide GaAs barriers) grown on (511) GaAs substrate. For comparison, similar samples grown on (100) substrates have also been studied. (511)-grown thin quantum wells may have possible quantum wire configuration. However, polarization studies show a small anisotropic absorption from the (511) sample, which indicates that the optical property of the (511)-quantum well is different than either that of a quantum wire or that of a (l00)-grown quantum well structures. A theoretical calculation, making a unitary transformation of the valence band k•P Hamiltonian matrix to the (511) base, and using a perturbation method to determine the new wavefunctions, yield an anisotropic absorption comparable with the experimental result. We have also compared the transition energies from PL data with the calculated one using the conventional effective mass approximation.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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References

1 Permagorov, S.A., Reznitskii, A.N., Verbin, S.Yu., and Lysenko, V.G., Pisma Zh. Eksp. Teor. Fiz. 37, 390 (1983) [JETP Lett. 37, 462 (1983)]Google Scholar
2 Pollak, F.H. “Strained-layer superlattice: Physics” Vol. 32, p. 17. ed. Pearsall, T.P., Academic Press, Inc., (1990)CrossRefGoogle Scholar
3 Broido, D.A. and Shem, L.J., Phys. Rev. B 31, 888 (1985)CrossRefGoogle Scholar
4 Rose, M.E. “Elementary Theory of Angulor Momentum” p. 52, John Wiley & Sons, Inc., NY (1957)Google Scholar

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Optical Characterization of Ultra-Thin InAs Strain-Layer Quantum Wells Grown on (511) GaAs Substrate
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