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Multiphoton Polariton Spectroscopy on ZnO
Author(s) -
Fiebig M.,
Fröhlich D.,
PahlkeLerch Ch.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221770114
Subject(s) - polariton , ansatz , physics , exciton polaritons , spectroscopy , valence (chemistry) , isotropy , excitation , condensed matter physics , atomic physics , quantum mechanics
Different nonlinear techniques are applied to investigate excitonic from the upper valence bands (symmetry Γ 7 , Γ 9 , Γ 7 ) to the lowest conduction band (symmetry Γ 7 ) in ZnO. Coherent techniques like three‐photon difference frequency generation are used for resonances on the lower polariton branch, whereas incoherent techniques are well suited for the investigation on the upper polariton branch. Paraexcitons are detected without external perturbation. The angular dependence of the longitudinal transverse splitting is investigated by excitation of mixed mode polaritons and analyzed with use of a suitable ansatz for the dielectric tensor in the classical wave equation. The isotropic point at 3.157 eV is studied by non‐resonant second harmonic generation.