Free-carrier effects in gallium nitride epilayers: Valence-band dispersion

P.A. Shields, R.J. Nicholas, F.M. Peeters, B. Beaumont, P. Gibart

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The dispersion of the A-valence-band in GaN has been deduced from the observation of high-index magnetoexcitonic states in polarized interband magnetoreflectivity and is found to be strongly nonparabolic with a mass in the range 1.2-1.8me. It matches the theory of Kim et al. [Phys. Rev. B 56, 7363 (1997)] extremely well, which also gives a strong k-dependent A-valence-band mass. A strong phonon coupling leads to quenching of the observed transitions at about an LO-phonon energy above the band gap and a strong nonparabolicity. The valence band was deduced from subtracting from the reduced dispersion the electron contribution with a model that includes a full treatment of the electron-phonon interaction.
Original languageEnglish
Article number81203
Pages (from-to)812031-812034
Number of pages4
JournalPhysical Review B
Issue number8
Publication statusPublished - 2001

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    Shields, P. A., Nicholas, R. J., Peeters, F. M., Beaumont, B., & Gibart, P. (2001). Free-carrier effects in gallium nitride epilayers: Valence-band dispersion. Physical Review B, 64(8), 812031-812034. [81203].