Improved transport equations including correlations for electron-phonon systems: Comparison with exact solutions in one dimension

被引:11
作者
Fricke, J
Meden, V
Wohler, C
Schonhammer, K
机构
[1] Inst. fur Theor. Physik der Univ. G., 37073 Göttingen
关键词
D O I
10.1006/aphy.1997.5623
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study transport equations for quantum many-particle systems in terms of correlations by applying the general formalism developed in an earlier paper to exactly soluble electron-phonon models. The one-dimensional models considered are the polaron model with a linear energy dispersion for the electrons and a finite number of electrons and the same model including a Fermi sea (Tomonaga-Luttinger model). The inclusion of two-particle correlations shows a significant and systematic improvement in comparison with the usual non-Markovian equations in Born approximation. For example, the improved equations take into account the renormalization of the propagation by the self-energies to second order in the coupling. (C) 1997 Academic Press
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页码:177 / 197
页数:21
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