Reflectance and emission spectra of excitonic polaritons in GaN

K. Torii, T. Deguchi, Takayuki Sota, K. Suzuki, S. Chichibu, S. Nakamura

    Research output: Contribution to journalArticle

    65 Citations (Scopus)

    Abstract

    High-resolution reflectance and emission spectra have been measured for high-quality free-standing GaN nearly free from residual strains and impurities. They have been analyzed based on a model exciton-polariton picture in which free A, B, and C excitons couple simultaneously to an electromagnetic wave, where the effective-mass anisotropy and the optical anisotropy are taken into account. Taking account of the free-exciton damping, we have calculated not only the dispersion relations but also the energy dependence of the imaginary part of the wave vectors for the excitonic polaritons. Furthermore, the lifetime of each polariton branch has been calculated combining the imaginary part of the polariton wave vectors and the group velocity obtained from the polariton dispersion relations. It is demonstrated that information on the polariton lifetime is indispensable for interpreting the emission spectra. A brief discussion will be given on obtained values for some physical parameters, including hole parameters.

    Original languageEnglish
    Pages (from-to)4723-4730
    Number of pages8
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume60
    Issue number7
    Publication statusPublished - 1999

    Fingerprint

    Excitons
    polaritons
    emission spectra
    reflectance
    Optical anisotropy
    excitons
    Electromagnetic waves
    Anisotropy
    Damping
    Impurities
    life (durability)
    anisotropy
    group velocity
    LDS 751
    electromagnetic radiation
    damping
    impurities
    high resolution
    energy

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Torii, K., Deguchi, T., Sota, T., Suzuki, K., Chichibu, S., & Nakamura, S. (1999). Reflectance and emission spectra of excitonic polaritons in GaN. Physical Review B - Condensed Matter and Materials Physics, 60(7), 4723-4730.

    Reflectance and emission spectra of excitonic polaritons in GaN. / Torii, K.; Deguchi, T.; Sota, Takayuki; Suzuki, K.; Chichibu, S.; Nakamura, S.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 60, No. 7, 1999, p. 4723-4730.

    Research output: Contribution to journalArticle

    Torii, K, Deguchi, T, Sota, T, Suzuki, K, Chichibu, S & Nakamura, S 1999, 'Reflectance and emission spectra of excitonic polaritons in GaN', Physical Review B - Condensed Matter and Materials Physics, vol. 60, no. 7, pp. 4723-4730.
    Torii, K. ; Deguchi, T. ; Sota, Takayuki ; Suzuki, K. ; Chichibu, S. ; Nakamura, S. / Reflectance and emission spectra of excitonic polaritons in GaN. In: Physical Review B - Condensed Matter and Materials Physics. 1999 ; Vol. 60, No. 7. pp. 4723-4730.
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    AU - Chichibu, S.

    AU - Nakamura, S.

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