Effective electron mass and phonon modes in n-type hexagonal InN

A. Kasic, Mathias Schubert, Y. Saito, Y. Nanishi, G. Wagner

Research output: Contribution to journalArticle

183 Citations (Scopus)

Abstract

Infrared spectroscopic ellipsometry and micro-Raman scattering are used to study vibrational and electronic properties of high-quality hexagonal InN. The 0.22-μm-thick highly n-conductive InN film was grown on c-plane sapphire by radio-frequency molecular-beam epitaxy. Combining our results from the ellipsometry data analysis with Hall-effect measurements, the isotropically averaged effective electron mass in InN is determined as 0.14mO. The resonantly excited zone center E1(TO) phonon mode is observed at 477 cm-1 in the ellipsometry spectra. Despite the high electron concentration in the film, a strong Raman mode occurs in the spectral range of the unscreened A1(LO) phonon. Because an extended carrier-depleted region at the sample surface can be excluded from the ellipsometry-model analysis, we assign this mode to the lower branch of the large-wave-vector LO-phonon-plasmon coupled modes arising from nonconserving wave-vector scattering processes. The spectral position of this mode at 590 cm-1 constitutes a lower limit for the unscreened A1(LO) phonon frequency.

Original languageEnglish (US)
Article number115206
Pages (from-to)1152061-1152067
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number11
DOIs
StatePublished - Mar 15 2002

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electron mass
Ellipsometry
ellipsometry
Electrons
Conductive films
Spectroscopic ellipsometry
Aluminum Oxide
Hall effect
Molecular beam epitaxy
Sapphire
Electronic properties
Raman scattering
Scattering
coupled modes
Infrared radiation
radio frequencies
sapphire
molecular beam epitaxy
Raman spectra
scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effective electron mass and phonon modes in n-type hexagonal InN. / Kasic, A.; Schubert, Mathias; Saito, Y.; Nanishi, Y.; Wagner, G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 11, 115206, 15.03.2002, p. 1152061-1152067.

Research output: Contribution to journalArticle

Kasic, A. ; Schubert, Mathias ; Saito, Y. ; Nanishi, Y. ; Wagner, G. / Effective electron mass and phonon modes in n-type hexagonal InN. In: Physical Review B - Condensed Matter and Materials Physics. 2002 ; Vol. 65, No. 11. pp. 1152061-1152067.
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