DIRECT-GAP REDUCTION AND VALENCE-BAND SPLITTING OF ORDERED INDIRECT-GAP AlInP2 STUDIED BY POLARIZED PIEZOREFLECTANCE

The order-dependent direct-gap reduction and valence-band splitting in spontaneously ordered indirect-gap AlInP2 are determined by polarized piezoreflectance spectroscopy at RT. The experimentally deduced values of the ratio of band-gap reduction to crystal field splitting for the perfectly ordered...

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Published in:Jpn.J.Appl.Phys ,Part 1. Vol. 40, no. 6A, pp. 4064-4068. 2001 Part 1. Vol. 40, no. 6A, pp. 4064-4068. 2001, 2001, Vol.40 (6A), p.4064-4068
Main Authors: Yeh, W-C, Lin, C-J, Huang, Y-S, Chang, C-S, Tiong, K-K
Format: Article
Language:English
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Summary:The order-dependent direct-gap reduction and valence-band splitting in spontaneously ordered indirect-gap AlInP2 are determined by polarized piezoreflectance spectroscopy at RT. The experimentally deduced values of the ratio of band-gap reduction to crystal field splitting for the perfectly ordered alloys, z=-D Eg(1)/DCF(1)=1.15, and the ratio of band-gap reduction to the ordering change of spin-orbit splitting between the perfectly ordered and random alloys, x=-D Eg(1)/[DSO(1)-DSO(0)]=8.24, are in good agreement with recent theoretically calculated value of 1.13 and 13.5, resp., but are larger than those of a previous report using dark-field spectroscopy. 20 refs.
ISSN:0021-4922
DOI:10.1143/JJAP.40.4064