Abstract
In this paper, the effective Hamiltonian of the exciton in strong-coupling polyatomic crystals is obtained by the method of a linear combination operator and a simple unitary transformation. The self-trapping energy of the exciton could be written as a series in α-1, the first term being proportion to α, the coupling constant. The selftrapping energy contains an extra contribution due to crossed terms between the different phonon branches.
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Xiao, JL. Excitons in strong coupling polyatomic crystals. Z. Physik B - Condensed Matter 83, 367–371 (1991). https://doi.org/10.1007/BF01313407
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DOI: https://doi.org/10.1007/BF01313407