Path Integral Computation of Phonon Anharmonicity
软凝聚态物质
2009-11-10 v1 材料科学
摘要
The partition function of an oscillator disturbed by a set of electron particle paths has been computed by a path integral method which permits to evaluate at any temperature the relevant cumulant terms in the series expansion. The time dependent source current peculiar of the semiclassical Su-Schrieffer-Heeger model induces large electron-phonon anharmonicities on the phonon subsystem. As a main signature of anharmonicity the phonon heat capacity shows a peak whose temperature location strongly varies with the strength of the {\it e-ph} coupling. High energy oscillators are less sensitive to anharmonic perturbations.
引用
@article{arxiv.cond-mat/0309603,
title = {Path Integral Computation of Phonon Anharmonicity},
author = {Marco Zoli},
journal= {arXiv preprint arXiv:cond-mat/0309603},
year = {2009}
}