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学vasp的小白

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[求助] vasp计算的一些问题

在计算一个晶体时,算能带,极化这些值时要用上色散修正吗?什么时候要用上色散修正?什么时候不用?刚开始学,请说详细一点。

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fyuewen

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'dipole correction' is necessary for 2D/1D systems. For 3D bulk systems, it doesn't affect the physical properties.
It's not relevant to ferroelectric polairzation calculations.
Physicsloveukulele!Aloha!
2楼2024-04-27 16:53:38
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fgmsyutong

木虫 (文坛精英)

vasp手册IVDW
举几例  锂硫电池 OER CO2RR 黑磷 双层石墨烯
3d104s1
3楼2024-05-02 12:05:59
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fyuewen

金虫 (正式写手)

引用回帖:
2楼: Originally posted by fyuewen at 2024-04-27 16:53:38
'dipole correction' is necessary for 2D/1D systems. For 3D bulk systems, it doesn't affect the physical properties.
It's not relevant to ferroelectric polairzation calculations.

My bad! I misunderstood the Chinese terminology! As to dispersion correction, you can always use it for all the materials, see https://pubs.aip.org/aip/jcp/article-abstract/132/15/1
However, it is noted in many cases its effects can be negligible. But when the system has long range interactions, you had better use it! To me, ferroelectrics especially for those with layered structures are such a platform

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Physicsloveukulele!Aloha!
4楼2024-05-03 12:33:31
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