Long-range correlation energies and off-diagonal interactions for the $π$ electronic systems

Details Long-range correlation energies and off-diagonal interactions for the $π$ electronic systems Long-range correlation energies and off-diagonal interactions for the $π$ electronic systems

2008-03-02

arxiv.org/abs/0803.0127v3

Physics

Condensed Matter

Other Condensed Matter

5 pages, 2 tables, New version, Submitted

Scientific paper

The long-range correlation energies and the off-diagonal interactions are studied and a general formula for correlation energy $E_c$ of the $\pi$ electron systems is given, which is beyond the nearest-neighbor electron-electron interactions and includes the off-diagonal interactions. It is found that the effects of the off-diagonal interactions $W$ and $X$ on the correlation energies are opposite, but the influence of $X$ on the correlation energies is much stronger than that of $W$ on the correlation energies, and the correlation energies decrease with increasing the screening effect.

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