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From CCl£º ask£º I am interested in abinitio simulation,and I am really confused about differences between vasp& cpmd packages. Could anybody tell me what is the main methodology s aspects between these two software? It is better to say that if a job which is completed with vasp ,could be done with cpmd with same results or not?(with same plane wave cutoff and same cell characteristic in DFT and GGA with PW91 Basis set usages.) Answer£º I would say that there two main differences between VASP and CPMD. First, of course, as afar as I know (I am not a Vasp expert) VASP does only Born-Oppenheimer Molecular Dynamics whereas CPMD does both BO-MD and CP-MD. Second, VASP has been designed to treat metals and is good at this whereas Carr-Parrinello-MD is really difficult if you have a metal (or anything with a zero gap). So, if you have a metallic system, I would recommend VASP. If not, then CPMD should be fine, and faster if you use CP-MD. Another choice (beside CASTEP), is CP2K that is really fast for non metallic systems. I do not know how good it is for metallic systems as I do not use it. |
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