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2Â¥2009-08-02 19:10:53
xiao2008zhu
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Molecular dynamics in total energy DFT schemes is implemented in essentially the same way as in conventional forcefield-based methods. The main difference is that the atomic forces are derived by solving DFT equations rather than from empirical potentials of interatomic interactions. Electrons are kept on the Born-Oppenheimer surface by means of explicit electronic structure optimization after each MD step. A side effect of this is that evaluation of force and energy from first principles is always the most computationally expensive part of ab initio MD. As a result, the efficiency of the MD step itself has no impact on the speed of the calculation. [ Last edited by xiao2008zhu on 2009-8-2 at 21:15 ] |
3Â¥2009-08-02 21:13:32
xiao2008zhu
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4Â¥2009-08-02 21:14:41
beyondstar
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5Â¥2009-08-02 22:45:57
xiao2008zhu
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6Â¥2009-08-03 15:56:42
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7Â¥2009-08-04 14:52:28
meimeinn
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