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arXiv physics/0503218physics.chem-ph
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沿非线性绝热连接的交换关联势和每个粒子的局域能量

Exchange-correlation potentials and local energies per particle along non-linear adiabatic connections

Julien Toulouse, Francois Colonna, Andreas Savin

摘要:

我们研究非线性绝热连接路径的密度泛函理论使用修改后的电子-电子相互作用,执行远程/短程分离的库仑相互作用。这些绝热连接允许定义短程交换相关势和短程局部交换相关能量,我们已经精确计算了He和Be原子,并与局域密度近似(LDA)中的相应量进行了比较。结果证实,LDA更好地描述交换相关势和局域交换相关能量的每个粒子时,相互作用的范围减少。

英文摘要:

We study non-linear adiabatic connection paths in density-functional theory using modified electron-electron interactions that perform a long-range/short-range separation of the Coulomb interaction. These adiabatic connections allows to define short-range exchange-correlation potentials and short-range local exchange-correlation energies per particle that we have calculated accurately for the He and Be atoms and compared to the corresponding quantities in the local density approximation (LDA). The results confirm that the LDA better describes exchange-correlation potentials and local exchange-correlation energies per particle when the range of the interaction is reduced.

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