Summary
A significant correction to the value of the total exciton mass in polar materials results from the interaction of the electron and the hole with the longitudinal optical phonons. A procedure is given for computing this mass renormalization by means of the excitonic-polaron theory; numerical results are obtained for many substances. Evidence for this effect is found from a detailed analysis of experimental polariton dispersion data.
Riassunto
Una correzione significativa al valore della massa totale dell'eccitone si produce nei cristalli polari a causa dell'interazione dell'elettrone e della buca con i fononi ottici longitudinali. Si fornisce un procedimento per calcolare la rinormalizzazione della massa totale dell'eccitone estendendo la teoria dell'eccitone polaronico al caso d'impulso diverso da zero; si ottengono risultati numerici per un gran numero di sostanze polari. L'evidenza sperimentale di questo effetto è trovata mediante un'analisi dettagliata di dati sperimentali sulla dispersione spaziale dei polaritoni.
Резюме
В полярных кристаллах взаимодействе злектрона и дыры с продольными оптическими фононами производит значительное изменение значения полной массы экситона. Предлогается метод для вычисления перенормализации полной массы экситона при помощи распространеия теории поляритоного экситона на случай ненулевого импулса. Численные результаты получены для болыщого числа вещества. Экспериментальное выявление этого эффекта получено при помощи детального анализа экспериментальных данных п простраственной дисперсии поляритонов.
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References
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Iadonisi, G., Bassani, F. Polaronic correction to the exciton effective mass. Il Nuovo Cimento D 9, 703–714 (1987). https://doi.org/10.1007/BF02457030
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DOI: https://doi.org/10.1007/BF02457030