Exciton-Phonon Interaction in the Coherent Potential Approximation with Application to Optical Spectra

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概要

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• Exciton in the phonon field is treated with the coherent potential approximation which has originally been developed for electron in random lattice. Scattering potential at each lattice site is a random variable which takes a Gaussian distribution originating from thermal vibrations of the lattice. The approximation describes the change of character of exciton in the phonon field near the band edge. In the weak scattering case, the absorption line shape calculated is Lorentz-like in the main part and in the high energy tail of the peak due to the motional narrowing, while it switches over, below the peak, to the Urbach-Martienssen tail representing the localized feature of exciton. The emission spectrum changes from the resonance type to the Stokes-shifted type as exciton-phonon coupling increases. Overall line shape of optical spectrum is obtaineble over the whole range of coupling strength. The approximation corresponps to the self-consistent version of the theory by Sumi and Toyozawa (J. Phys. Soc. Japan 31 (1971) 342).

• 社団法人日本物理学会の論文
• 1972-03-05

著者

• Sumi Hitoshi

  The Institute For Solid State Physics University Of Tokyo:(present Address)electrotechnical Laborato

• Sumi Hitoshi

  The Institute For Solid State Physics The University Of Tokyo

• Sumi Hitoshi

  The Institute For Solid State Physics University Of Tokyo

関連論文

• Scattering Theory for the Metamorphism of Van Hove Singularities in the Optical Spectra of Solids
• Polaron Conductions from Band to Hopping Types. : II. Hall Effect
• Polaron Conductions from Band to Hopping Types
• Exciton-Phonon Interaction in the Coherent Potential Approximation with Application to Optical Spectra
• Urbach-Martienseen Rule and Exciton Trapped Momentarily by Lattice Vibrations

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