Self-energy of phonons in anharmonic one-dimensional crystals |
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Authors: | Dr Peter F Meier |
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Institution: | 1. Institut für Theoretische Physik, Universit?t Zürich, Sch?nberggasse 9, CH-8001, Zürich
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Abstract: | Using the expression obtained by Green's function methods the self-energy of phonons, interacting through anharmonic terms of third and fourth order in the expansion of the potential energy, is calculated for a linear chain without further approximations. The phonon energy shift and width show strong dependence on the frequency and the wave-vector. |
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