PERINUCLEAR PROJECTIONS OF THE OUTER NUCLEAR MEMBRANE IN ULTRASTRUCTURE OF MULTIFORM GLYOBLASTOMA IN HUMAN BRAIN

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NUCLEAR MEMBRANE CHANGES OF HUMAN MULTIFORM GLIOBLASTOMA (ELECTRON MICROSCOPE STUDY)

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RHEOENCEPHALOGRAPHIC CHANGES OF CEREBRAL ATHEROSCLEROSIS

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TREATMENT OF CHILDHOOD EPILEPSY WITH DEPAKINE

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ONE CASE OF NEUROLOGICAL COMPLICATION WITH GIGANTIC CAVERNOSAL HEMANGIOMA - SYNDROME OF КAZABACH-MERRY

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Theory of optical spectra of polar quantum wells: Temperature effects

Theoretical and numerical calculations of the optical absorption spectra of excitons interacting with longitudinal-optical phonons in quasi-2D polar semiconductors are presented. In II-VI semiconductor quantum wells, exciton binding energy can be tuned on- and off-resonance with the longitudinal-optical phonon energy by varying the quantum well width. A comprehensive picture of this tunning effect on the temperature-dependent exciton absorption spectrum is derived, using the exciton Green's function formalism at finite temperature. The effective exciton-phonon interaction is included in the Bethe-Salpeter equation. Numerical results are illustrated for ZnSe-based quantum wells. At low temperatures, both a single exciton peak as well as a continuum resonance state are found in the optical absorption spectra. By contrast, at high enough temperatures, a splitting of the exciton line due to the real phonon absorption processes is predicted. Possible previous experimental observations of this splitting are discussed.Comment: 10 pages, 9 figures, to appear in Phys. Rev. B. Permanent address: [email protected]