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arXiv 2012.12068physics.chem-ph
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无轨道密度泛函理论中稳健全电子优化的信赖域镜像方法

Robust All-Electron Optimization in Orbital-Free Density Functional Theory Using the Trust Region Image Method

Matthew S. Ryley, Michael Withnall, Tom J. P. Irons, Trygve Helgaker, Andrew M. Teale

摘要:

我们提出了一个高斯基的无轨道密度泛函理论(OF-DFT)的实现,其中的信赖域图像方法(TRIM)用于优化。这种二阶优化方案已被构造为提供基准的全电子结果与粒子数约束,相关的化学势和电子密度的非常紧密的收敛。结果表明,通过保留优化的鞍点性质并同时优化密度和化学势,收敛所需的迭代次数减少了一个数量级。该方法进行了比较,并与陈,科恩和汉迪提出的嵌套优化方案的一个新的实现。我们的实现允许半本地动能(和交换相关)泛函处理自洽在全电子计算。这些计算的全电子高斯基设置将使直接比较与广泛的标准高精度量子化学方法,以及与科恩-沙姆密度泛函理论。我们希望,目前的实施将提供一个有用的工具,分析有限系统中的近似动能泛函的性能。

英文摘要:

We present a Gaussian-basis implementation of orbital-free density-functional theory (OF-DFT) in which the trust-region image method (TRIM) is used for optimization. This second-order optimization scheme has been constructed to provide benchmark all-electron results with very tight convergence of the particle number constraint, associated chemical potential and electron density. It is demonstrated that, by preserving the saddle-point nature of the optimization and simultaneously optimizing the density and chemical potential, an order of magnitude reduction in the number of iterations required for convergence is obtained. The approach is compared and contrasted with a new implementation of the nested optimization scheme put forward by Chan, Cohen and Handy. Our implementation allows for semi-local kinetic-energy (and exchange-correlation) functionals to be handled self-consistently in all-electron calculations. The all-electron Gaussian-basis setting for these calculations will enable direct comparison with a wide range of standard high-accuracy quantum-chemical methods as well as with Kohn-Sham density-functional theory. We expect that the present implementation will provide a useful tool for analysing the performance of approximate kinetic-energy functionals in finite systems.

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