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Abstract
We present a photoluminescence study of the free-exciton singlet and triplet ground states in GaTe as a function of temperature from 5 to 40 K. Over the range 5-25 K, the temperature variation of excitonic-emission linewidth and peak energy comes mainly from exciton-acoustic-phonon interactions via the deformation potential. The contribution from exciton scattering by optical phonons of energy 14 meV begins at temperatures above ∼25 K. The exciton-optical-phonon interaction is the dominant scattering process above 30 K and effectively dissociates excitons since the energy of the optical phonon mode is close to the exciton binding energy. The luminescence thus decreases rapidly above 30 K and disappears at about 40 K
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