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

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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
Volume64
Issue number8
DOIs
Publication statusPublished - 2001

Fingerprint

Gallium nitride
Epilayers
gallium nitrides
Valence bands
valence
Electron-phonon interactions
Quenching
Energy gap
electron phonon interactions
Electrons
quenching
gallium nitride
electrons
energy

Cite this

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]. https://doi.org/10.1103/PhysRevB.64.081203

Free-carrier effects in gallium nitride epilayers: Valence-band dispersion. / Shields, P.A.; Nicholas, R.J.; Peeters, F.M.; Beaumont, B.; Gibart, P.

In: Physical Review B, Vol. 64, No. 8, 81203, 2001, p. 812031-812034.

Research output: Contribution to journalArticle

Shields, PA, Nicholas, RJ, Peeters, FM, Beaumont, B & Gibart, P 2001, 'Free-carrier effects in gallium nitride epilayers: Valence-band dispersion', Physical Review B, vol. 64, no. 8, 81203, pp. 812031-812034. https://doi.org/10.1103/PhysRevB.64.081203
Shields, P.A. ; Nicholas, R.J. ; Peeters, F.M. ; Beaumont, B. ; Gibart, P. / Free-carrier effects in gallium nitride epilayers: Valence-band dispersion. In: Physical Review B. 2001 ; Vol. 64, No. 8. pp. 812031-812034.
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