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arXiv 0812.0244cond-mat.mtrl-sci
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范德瓦尔斯密度泛函的有效实现:应用于双壁碳纳米管

Efficient implementation of a van der Waals density functional: Application to double-wall carbon nanotubes

Guillermo Roman-Perez, Jose M. Soler

摘要:

我们提出了一个有效的实现的范德华密度泛函的Dion等人[物理。92,246401(2004)],其将非局部相关能量表示为双空间积分。我们因式分解的积分内核,并使用快速傅立叶变换来评估自洽势,总能量和原子力,在N log(N)操作。由此产生的开销在总的计算成本,在半局部泛函,是非常温和的中型和大型系统。我们应用该方法计算了双壁碳纳米管的结合能以及相对平移和转动的势垒。

英文摘要:

We present an efficient implementation of the van der Waals density functional of Dion et al [Phys. Rev. Lett. 92, 246401 (2004)], which expresses the nonlocal correlation energy as a double spacial integral. We factorize the integration kernel and use fast Fourier transforms to evaluate the selfconsistent potential, total energy, and atomic forces, in N log(N) operations. The resulting overhead in total computational cost, over semilocal functionals, is very moderate for medium and large systems. We apply the method to calculate the binding energies and the barriers for relative translation and rotation in double-wall carbon nanotubes.

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