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Anisotropy and dispersion of coupled plasmon-LO-phonon modes in Sb2Te3

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Zeitschrift für Physik B Condensed Matter

Abstract

Coupled plasmon-LO-phonon modes have been studied in Sb2Te3 (bulk samples and epitaxial layers) by Raman scattering and IR-reflectivity. The high frequency plasmonlike mode (Ω3: 300–2,000 cm−1) is observed, in contrast to the other two phonon-like plasmon-LO-phonon modes. The latter are expected to have negligible scattering intensities, since the IR-phonons in Sb2Te3 are not Raman-active. The Ω3-mode shows up with different frequencies since the effective masses, i.e. the plasmon is anisotropic. Dispersion measurements and their comparison with the results of a theoretical description (hydrodynamical theory) gives good agreement. From this values for the anisotropic effective masses are obtained.

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Author notes

  1. W. Richter & U. Nowak

    Present address: I. Physikalisches Institut, RWTH Aachen, Sommerfeldstrasse, D-5100, Aachen, Federal Republic of Germany

Authors and Affiliations

  1. Abteilung Festkörperphysik, Universität Ulm, Federal Republic of Germany

    W. Richter & U. Nowak

  2. I. Physikalisches Institut, RWTH Aachen, Sommerfeldstrasse, D-5100, Aachen, Federal Republic of Germany

    A. Krost

  3. Physical Laboratory III, Polytechnion Athens, Athens, Greece

    E. Anastassakis

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  1. W. Richter
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  2. A. Krost
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  3. U. Nowak
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  4. E. Anastassakis
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Richter, W., Krost, A., Nowak, U. et al. Anisotropy and dispersion of coupled plasmon-LO-phonon modes in Sb2Te3 . Z. Physik B - Condensed Matter 49, 191–198 (1982). https://doi.org/10.1007/BF01313026

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  • DOI: https://doi.org/10.1007/BF01313026

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