Elevated temperature dependence of the anisotropic visible-to-ultraviolet dielectric function of monoclinic β -Ga2O3

A. Mock, J. Vanderslice, R. Korlacki, J. A. Woollam, M. Schubert

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We report on the temperature dependence of the dielectric tensor elements of n-type conductive β-Ga2O3 from 22 °C to 550 °C in the spectral range of 1.5 eV-6.4 eV. We present the temperature dependence of the excitonic and band-to-band transition energy parameters using a previously described eigendielectric summation approach [A. Mock et al., Phys. Rev. B 96, 245205 (2017)]. We utilize a Bose-Einstein analysis of the temperature dependence of the observed transition energies and reveal electron coupling with average phonon temperature in excellent agreement with the average over all longitudinal phonon plasmon coupled modes reported previously [M. Schubert et al., Phys. Rev. B 93, 125209 (2016)]. We also report a linear temperature dependence of the wavelength independent Cauchy expansion coefficient for the anisotropic below-band-gap monoclinic dielectric tensor elements.

Original languageEnglish (US)
Article number041905
JournalApplied Physics Letters
Issue number4
Publication statusPublished - Jan 22 2018


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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