Abstract
We systematically study the fluorescence of low-density Frenkel excitons in a crystal slab containing ${N}_{T}$ V-type three-level atoms. Based on symmetric quasispin realization of SU(3) in large N limit, the two-mode exciton operators are invoked to depict various collective excitations of the collection of these V-type atoms starting from their ground state. By making use of the rotating-wave approximation, the light intensity of radiation for the single-lattice layer is investigated in detail. As a quantum coherence effect, the quantum beat phenomenon is discussed in detail for different initial excitonic states. We also test the above results analytically without the consideration of the rotating-wave approximation and the self-interaction of radiance field is also included.
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