Phonon-assisted luminescence of polar semiconductors: Fröhlich coupling versus deformation-potential scattering

A. Chernikov, V. Bornwasser, M. Koch, S. Chatterjee, C. N. Böttge, T. Feldtmann, M. Kira, S. W. Koch, T. Wassner, S. Lautenschläger, B. K. Meyer, M. Eickhoff

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Abstract

The origin of exciton-phonon interaction in polar semiconductors is investigated. The relative contributions of Fröhlich coupling and deformation potential scattering are identified by analyzing experimentally measured phonon-assisted luminescence using a rigorous many-body approach. Our experiment-theory comparison demonstrates that phonon scattering is significantly influenced by many-body interactions. Fröhlich interaction can be strongly suppressed for excitons even when it dominates electronic single particle scattering. The results show that deformation potential scattering dominates the exciton-phonon interaction in ZnO, whereas Fröhlich interaction prevails in CdS, and both coupling mechanisms yield almost equal contributions in ZnS.

Original languageEnglish (US)
Article number035201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number3
DOIs
StatePublished - Jan 4 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Chernikov, A., Bornwasser, V., Koch, M., Chatterjee, S., Böttge, C. N., Feldtmann, T., Kira, M., Koch, S. W., Wassner, T., Lautenschläger, S., Meyer, B. K., & Eickhoff, M. (2012). Phonon-assisted luminescence of polar semiconductors: Fröhlich coupling versus deformation-potential scattering. Physical Review B - Condensed Matter and Materials Physics, 85(3), [035201]. https://doi.org/10.1103/PhysRevB.85.035201