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

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6 Author(s)
Chang, Y.-M. ; Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan, Republic of China ; Chuang, C.T. ; Chia, C.T. ; Tsen, K.T.
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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 1.5×1019 cm-3. This phenomenon is attributed to the hybridization of a coherent A1(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 1020 cm-3, much higher than the bulk carrier concentration 1×1018 cm-3 determined by Hall effect measurement.

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Applied Physics Letters  (Volume:85 ,  Issue: 22 )