Phonon hardening due to the small-polaron effect
| Autor: | Dalibor Čevizović, Dragan Kostic, Zoran Ivić, Slobodan Zeković |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Coupling constant
Physics polaron Condensed matter physics Phonon phonon hardening modification of speed of sound 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Polaron 01 natural sciences Electronic Optical and Magnetic Materials Renormalization Effective mass (solid-state physics) Molecular vibration Speed of sound 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Adiabatic process |
| Zdroj: | Physica B: Condensed Matter |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2004.11.070 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect