L-point backfolding in orderedGaInP2determined by electroabsorption measurements

Autor:	R. Stubner, J. Krauss, Peter Kiesel, O. Pankratov, M. Moser, G. H. Döhler, T. Kippenberg, Roland Winkler, J. Spieler
Rok vydání:	1999
Předmět:	L band Materials science Condensed matter physics business.industry Band gap Optoelectronics Direct and indirect band gaps Absorption (electromagnetic radiation) business Thermal conduction Polarization (waves) Anisotropy Semimetal
Zdroj:	Physical Review B. 60:4446-4449
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.60.4446
Popis:	We have studied a series of single variant-ordered ${\mathrm{GaInP}}_{2}$ bulk samples by measuring the Franz-Keldysh absorption. We observe a high-energy transition approximately 0.4 eV above the band gap, which originates from the back-folded conduction L band. It exhibits a strong polarization anisotropy and shifts linearly to higher energies with the ordering-induced decrease of the band gap. These measurements indicate, that about 20% of the band-gap reduction is due to the valence band, which is shifted upwards.
Databáze:	OpenAIRE
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