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Dielectric tensor of monoclinic Ga2O3 single crystals in the spectral range 0.5–8.5 eV

The dielectric tensor of Ga2O3 in the monoclinic (β) phasewas determined by generalized spectroscopic ellipsometry in a wide spectral range from 0.5 eV to 8.5 eV as well as by density functional theory calculations combined with many-body perturbation theory including quasiparticle and excitonic effects. The dielectric tensors obtained by both methods are in excellent agreement with each other and the observed transitions in the dielectric function are assigned to the corresponding valence bands. It is shown that the off-diagonal element of the dielectric tensor reaches values up to |εxz| ≈ 0.30 and cannot be neglected. Even in the transparent spectral range where it is quite small (|εxz| < 0.02) it causes a rotation of the dielectric axes around the symmetry axis of up to 20◦.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa.de:bsz:15-qucosa-189178
Date20 November 2015
CreatorsSturm, Chris, Furthmüller, Jürgen, Bechstedt, Friedhelm, Schmidt-Grund, Rüdiger, Grundmann, Marius
ContributorsUniversität Leipzig, Institut für Experimentelle Physik II, Friedrich-Schiller-Universität Jena, Institut für Festkörpertheorie und -optik, AIP Publications,
PublisherUniversitätsbibliothek Leipzig
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typedoc-type:article
Formatapplication/pdf
SourceAPL materials 2015, 3:106106

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