Phonon hardening due to the small-polaron effect
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The influence of the small-polaron effect on the vibrational properties of the strongly coupled electron-phonon system is investigated. It was found that polaron-phonon interaction may cause a noticeable renormalization of the phonon spectra. These changes may be observed by the measurements of the speed of sound for which a very specific dependence on temperature, values of coupling constant and adiabatic parameter is expected. We also found that the rise of the small-polaron effective mass as a function of the coupling constant should be considerably moderated than that anticipated without taking into account the modification of the vibrational spectra. (C) 2004 Elsevier B.V. All rights reserved.
Кључне речи:polaron / phonon hardening / modification of speed of sound
Извор:Physica B: Condensed Matter, 2005, 355, 1-4, 417-426
ISSN: 0921-4526 (print)