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

Janos Olajos; Werner Wegscheider; Gerhard Abstreiter

doi:10.1063/1.107983

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

Janos Olajos, Werner Wegscheider, Gerhard Abstreiter

TUM Emeriti of Excellence

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Abstract

Band-to-band infrared absorption has been studied in a series of Sn ₁Ge_m (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 theoretical calculations. The temperature dependence of the band gaps show the usual behavior, at low temperatures quadratic and at higher temperatures linear decrease with increasing temperature.

Original language	English
Pages (from-to)	3130-3132
Number of pages	3
Journal	Applied Physics Letters
Volume	61
Issue number	26
DOIs	https://doi.org/10.1063/1.107983
State	Published - 1992

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abstract = "Band-to-band infrared absorption has been studied in a series of Sn 1Gem (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 theoretical calculations. The temperature dependence of the band gaps show the usual behavior, at low temperatures quadratic and at higher temperatures linear decrease with increasing temperature.",

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AB - Band-to-band infrared absorption has been studied in a series of Sn 1Gem (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 theoretical calculations. The temperature dependence of the band gaps show the usual behavior, at low temperatures quadratic and at higher temperatures linear decrease with increasing temperature.

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

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