Polariton in Anharmonic Crystals
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概要
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Explicit expression for the mixing interaction due to the lattice anharmonicity between the upper and the lower branch of polaritons is derived, using the generalized Langevin equation. Treating the mixing in a rough approximation, the calculated dispersion of the damped polariton qualitatively coincides with the phenomenological one used by Rimai et al. [Phys. Rev. 168 (1968) 623] in explaining their observed data in BaTiO_3. Their observed data, however, does not call for the concept of polariton and the frequency shift considered by them is concluded to come from nothing but the coupling between the annihilation and the creation operater for the same Fourier component of the displacement of the ions.
- 社団法人日本物理学会の論文
- 1969-10-05
著者
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Ohtaka Kazuo
Department Of Applied Physics Faculty Of Engineering Chiba University
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Ohtaka Kazuo
Department Of Applied Physics Tokyo University
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Fujiwara Takeo
Department Of Applied Physics Tokyo University
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Fujiwara Takeo
Department Of Applied Physics Faculty Of Engineereing University Of Tokyo
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