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- W2000074156 abstract "The influence of thermal lattice dilation on the temperature shift of some optical transitions has been studied. Below 100 K the shift of both the direct gap at H and the indirect gap is determined by the lattice dilation perpendicular to the hexagonal axis c, caused by acoustical phonons which leads to an increase of the gap energy with rising temperature. At higher temperatures the electron-phonon coupling (mainly by optical phonons) gains importance and decreases the temperature coefficient of the gap energies. The energy of the direct gap at Z is less sensitive to the thermal dilation of the lattice. Es wurde der Einfluß der Gitterdilatation auf die Temperatur-Verschiebung einiger optischer Übergänge untersucht. Unterhalb 100 K wird die Verschiebung des direkten Gaps in H und dea indirekten Gaps bestimmt von der Gitterdehnung senkrecht zur c-Achse, die von akustischen Phononen verursacht wird. Dies führt zu einem Anstieg des Energie Gaps. Bei höheren Temperaturen bewirkt die Elektron-Phonon-Kopplung (hauptsächlich durch optische Phononen) eine Abnahme des Temperatur-Koeffizienten des direkten und indirekten Gaps. Das direkte Gap im Punkt Z wird durch die thermische Ausdehnung des Gitters weniger beeinflußt." @default.
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- W2000074156 date "1975-08-01" @default.
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- W2000074156 title "Contribution of Lattice Dilation to the Temperature Shift of the Energy Gaps in Trigonal Selenium" @default.
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- W2000074156 doi "https://doi.org/10.1002/pssb.2220700205" @default.
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