Oblique-Incidence Reflection Spectra of Excitons in Uniaxially-Strained Alkali Iodide Crystals

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  • Ohno Nobuhito
    Department of Solid State Electronics, Faculty of Engineering, Osaka Electro-Communication University
  • Hashimoto Satoshi
    Kyoto University of Education
  • Itoh Minoru
    Department of Applied Science, Faculty of Engineering, Shinshu University

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  • Oblique Incidence Reflection Spectra of

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Oblique-incidence reflection spectrum of the lowest 1s exciton in alkali iodides has been measured by using linearly polarized light for thin crystals of thickness ∼0.1 μm at 11 K. These thin crystals are deformed uniaxially because of the difference in thermal contractions between alkali iodides and quartz plates, details of which are discussed. In RbI and KI, an additional structure appears on the high-energy side of the exciton band in the p-polarized spectrum, and it becomes clearer with increasing the angle of incidence θ. From the θ-dependence of the line shape, it is concluded that the additional structure is attributed to the longitudinal excitons becoming observable by a uniaxial stress. The results are discussed in terms of the exciton-polariton picture under the uniaxial symmetry.

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