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Optical spectroscopic observation of spontaneous long range ordering in AlGaInP
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We report the unambiguous optical spectroscopic observation of spontaneous long-range crystal ordering in AlGaInP epitaxial layers grown by metalorganic vapor phase epitaxy. Polarized spectroscopy demonstrates the existence of an in-plane anisotropy for samples grown on substrates oriented close to (100). This anisotropy results from the order-induced splitting of the normally degenerate zone-center valence-band states. Our measurements allow the size of the valence-band splitting to be measured and also allow a determination of the order-induced band-gap reduction. Both of these quantities are found to decrease with increasing misorientation of the substrate away from (100), indicating that the degree of ordering also decreases with increasing misorientation.
Title: Optical spectroscopic observation of spontaneous long range ordering in AlGaInP
Description:
We report the unambiguous optical spectroscopic observation of spontaneous long-range crystal ordering in AlGaInP epitaxial layers grown by metalorganic vapor phase epitaxy.
Polarized spectroscopy demonstrates the existence of an in-plane anisotropy for samples grown on substrates oriented close to (100).
This anisotropy results from the order-induced splitting of the normally degenerate zone-center valence-band states.
Our measurements allow the size of the valence-band splitting to be measured and also allow a determination of the order-induced band-gap reduction.
Both of these quantities are found to decrease with increasing misorientation of the substrate away from (100), indicating that the degree of ordering also decreases with increasing misorientation.
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