Dynamical Coherent Potential Approximation for Light Scattering Spectra in Exciton-Phonon Systems
1988 年 57 巻 11 号 p. 4029-4035
詳細
1988 年 57 巻 11 号 p. 4029-4035
The dynamical coherent potential approximation (DCPA) for one-particle properties of excitons coupled to Einstein phonons is extended to two-particle Green functions by taking the two-particle vertex part into account in a way consistent with the one-particle DCPA. This formalism provides a numerically tractable approximation scheme for optical resonance scattering spectra, including time-resolved emission spectra, in the entire ranges of the exciton-phonon coupling strength and the exciton transfer energy.
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