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Çë²»ÒªÓ÷ÒëÈí¼þ¼òµ¥·Ò룬лл£¡ In the proposed project, we will adopt a concurrent and seamless multiscale technique, which is conceptually similar to that developed by the present authors in Yeak et al. [102] to couple MD with semi-empirical tight binding. That approach will be adopted to couple MD and DFT. Here we describe three region types: the pure MD region, the DFT near region, and the DFT far region. As shown in Fig 3.5(a), the DFT domain comprises the near and far regions. The DFT far region, which is a relatively small sub-domain, is an overlap region used to achieve a seamless coupling between the MD and DFT regions. The MD method is applied to both the pure MD and DFT far regions. The resultant forces and velocities of the atoms in these two regions are determined by the MD method. The DFT method is applied to both the DFT near and far regions but only the forces and velocities of the atoms in the near region are determined by the DFT method. The average width of the far region is 2.6 Å. As shown in Fig 3.5(b), the periodic boundary condition (PBC) is adopted for near and far DFT regions by applying the supercell concept. Based on the supercell approach, the model is thus not affected by the PBC because the near region is non-PBC whereas the near and far regions as a whole are PBC-confined. For the DFT analysis of the DFT near and far regions, the forces acting on the atoms at the boundary of the DFT far region are derived from the MD analysis. |
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