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Luminescence of Mixed-Mode Exciton-Polariton in CuGaS2
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The luminescence spectra of the mixed-mode exciton-polariton
in CuGaS2 are studied at 8.6 K in conjunction with the
absorption spectra.
By measuring emitted photons as a function of propagation direction with
respect to the z axis of the crystal, it is possible to vary the magnitude
of a longitudinal-exciton and extraordinary-photon coupling.
The effects of this coupling on the resonance energy and oscillator strength
of the extraordinary exciton-polariton are established for the emission line
of the Γ4 free exciton which exhibits a doublet structure.
In contrast, the emission spectra due to the ordinary photons show one
weak, sharp line in the same intrinsic exciton region as
the Γ4 line.
The polarization dependence of the emission intensity is greatly reduced
for this sharp line. The behavior is interpreted as arising due to
the optically forbidden exciton having Γ3 symmetry.
The resonant exciton transitions to the lower exciton-polariton branch
and the forbidden state are observed in the extraordinary and
ordinary absorption spectra, respectively.
Title: Luminescence of Mixed-Mode Exciton-Polariton in CuGaS2
Description:
The luminescence spectra of the mixed-mode exciton-polariton
in CuGaS2 are studied at 8.
6 K in conjunction with the
absorption spectra.
By measuring emitted photons as a function of propagation direction with
respect to the z axis of the crystal, it is possible to vary the magnitude
of a longitudinal-exciton and extraordinary-photon coupling.
The effects of this coupling on the resonance energy and oscillator strength
of the extraordinary exciton-polariton are established for the emission line
of the Γ4 free exciton which exhibits a doublet structure.
In contrast, the emission spectra due to the ordinary photons show one
weak, sharp line in the same intrinsic exciton region as
the Γ4 line.
The polarization dependence of the emission intensity is greatly reduced
for this sharp line.
The behavior is interpreted as arising due to
the optically forbidden exciton having Γ3 symmetry.
The resonant exciton transitions to the lower exciton-polariton branch
and the forbidden state are observed in the extraordinary and
ordinary absorption spectra, respectively.
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