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 language | English |
|---|---|
| Article number | 81203 |
| Pages (from-to) | 812031-812034 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 64 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2001 |