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4Â¥: Originally posted by DarkArchon at 2014-02-26 16:43:50
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2Â¥: Originally posted by DarkArchon at 2014-02-25 21:43:28
NELM Êǵç×Ó×ÔÇ¡×î´ó²½Êý£¬³¬¹ýÕâ¸öÊý£¬²»¹ÜÊÕÁ²Óë·ñ£¬¼ÆËã¶¼»áÍ£Ö¹¡£
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3Â¥: Originally posted by liufeng0619 at 2014-02-26 08:45:50
ÄãÒâ˼ÊÇNELMDLÊǵç×Ó·Ç×ÔÇ¢²½Êý£¬Ò»°ãÓÃÓÚ¸´Ôӽṹ£¬¶ÔÂð£¿...

NELMDLÖ»ÊǰïÖú²»ÈÝÒ×ÊÕÁ²µÄ½á¹¹¿ìËÙÊÕÁ²£¬±ÈÈçÄãµÄ³õʼ½á¹¹±È½Ï¸´ÔÓ»òÕß²»ÊǺܺÏÀí¡£ËüµÄ¹¦Äܲ»ÄÜÈ¡´úNELM.
ÏÂÃæÊÇmanual ÀïÄÚÈÝ£¬Äã×Ðϸ¿´Ò»Ï   
NELMDL gives the number of non-selfconsistent steps at the beginning; if one initializes the orbitals randomly the initial orbitals are far from anything reasonable. The resulting charge density is also ¡¯nonsense¡¯. Therefore it makes sense to keep the initial Hamiltonian, which corresponds to the superposition of atomic charge densities, fixed during the first few steps.
    Choosing a ¡¯delay¡¯ for starting the charge density update becomes essential in all cases where the SC-convergence is very bad (e.g. surfaces or molecules/clusters, chains). Without setting a delay VASP will probably not converge or at least the convergence speed is slowed down.
    NELMDL might be positive or negative. A positive number means that a delay is applied after each ionic movement ¡ª in general not a convenient option. A negative value results in a delay only for the start-configuration.
4Â¥2014-02-26 16:43:50
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