Phonon-assisted luminescence of polar semiconductors: Fröhlich coupling versus deformation-potential scattering
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Contributors
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.
Details
Original language | English |
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Article number | 035201 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 85 |
Issue number | 3 |
Publication status | Published - 4 Jan 2012 |
Peer-reviewed | Yes |
Externally published | Yes |