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Exciton states in semi‐infinite molecular crystals with a point defect near the surface
Author(s) -
Sugakov V. I.,
Tovstenko V. I.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220960132
Subject(s) - exciton , impurity , crystal (programming language) , surface (topology) , spectrum (functional analysis) , condensed matter physics , coupling (piping) , boundary (topology) , distortion (music) , biexciton , physics , molecular physics , materials science , quantum mechanics , mathematics , geometry , mathematical analysis , amplifier , optoelectronics , cmos , computer science , metallurgy , programming language
The energy spectrum of a semi‐infinite molecular crystal with a point defect on the surface is studied. It is shown that the criterion of uncoupling and the position of the impurity level depend on the distance of the impurity to a crystal boundary. In the case when a level of a surface exciton exists in the system, the uncoupling of the impurity term from the surface exciton band occurs at any slightest distortion of the molecule term. The data obtained can be used to investigate a number of phenomena such as the phonon spectrum and the electron spectrum in the approximation of tight coupling and in some other cases.