Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 24, Pages 4866-4868Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1762694
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The optical reflection spectra have been measured on a high-quality wurtzite aluminum nitride (AlN) single crystal with synchrotron radiation in the range of 6-16 eV at different temperatures. The energy positions of the dominant structures due to the critical point (CP) transitions have been extracted by employing Adachi's dielectric function model. By the aid of the band structure of AlN, we have assigned up to ten CP transitions in the reflection spectra. The crystal-field splitting at the center of the Brilliouin zone is observed to be 110 meV. We have further revealed the temperature dependencies of these interband transitions. (C) 2004 American Institute of Physics.
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