Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN

Y. M. Chang, C. T. Chuang, C. T. Chia, K. T. Tsen, H. Lu, W. J. Schaff

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Abstract

Coherent phonon spectroscopy of a high-quality InN epitaxial layer is carried out using time-resolved second-harmonic generation. A coherent longitudinal optical phonon and plasmon coupling mode only at 447 cm -1 can be resolved in the spectrum. Its frequency shows no dependence on the photoinjected carrier density up to 1.5 × 10 19 cm -3. This phenomenon is attributed to the hybridization of a coherent A 1(LO) phonon with the intrinsic cold plasma accumulated in the near-surface region of InN, where the plasma density could reach on the order of 10 20 cm -3, much higher than the bulk carrier concentration 1 × 10 18 cm -3 determined by Hall effect measurement.

Original languageEnglish
Article number3
Pages (from-to)5224-5226
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number22
DOIs
Publication statusPublished - 2004 Nov 29

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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