Path Integral Computation of Phonon Anharmonicity

Details Path Integral Computation of Phonon Anharmonicity Path Integral Computation of Phonon Anharmonicity

2003-09-26

arxiv.org/abs/cond-mat/0309603v1

Eur.Phys.J. B vol.40, 79 (2004)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1140/epjb/e2004-00241-7

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.

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