Urbach-Martienssen tails in a wurtzite GaN epilayer

S. Chichibu, T. Mizutani, T. Shioda, H. Nakanishi, T. Deguchi, T. Azuhata, T. Sota, S. Nakamura

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


Effects of an interaction between the electronic and lattice systems on the optical spectra of a wurtzite GaN epilayer were investigated. The exponentially increasing absorption tail was well explained as an Urbach-Martienssen tail, giving the characteristic phonon energy of 30 meV. The result indicates that few longitudinal optical phonons contribute to the exciton-phonon coupling even at room temperature.

Original languageEnglish
Pages (from-to)3440-3442
Number of pages3
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 1997 Jun 23


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