Interband absorption in alpha-Sn/Ge short-period superlattices

DOI to cite this document:: 10.5283/epub.9990

Wegscheider, Werner ; Olajos, Janos ; Abstreiter, Gerhard

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Date of publication of this fulltext: 26 Oct 2009 13:56

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Abstract

Band-to-band infrared absorption has been studied in a series of Sn1Gem (m=11, 15, and 21) strained layer superlattices for the first time. The absorption coefficient shows a quadratic increase with two onsets, characteristic for indirect transitions. From a numerical fit to the absorption spectra, band gap energies are determined in the energy range between 0.55 and 0.75 eV, in accordance with ...