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Partial occupancies are read in from the wavecar and kept fixed throughout run 文章详细解析了在DFT计算中的一些重要参数,如ISTART和ICHARG用于结构优化和自洽计算的选择,ALGO和NELM控制电子步,IBRION和NSW涉及离子步,ISMEAR和SIGMA影响费米面附近的电子分布处理,以及DFT+U参数对强关联电子系统的影响。 Alternatively, you can also choose occupancies in the incar file with the tag ferwe (and ferdo for ispin = 2 calculations).
VASPwiki上建议(一)对于不知道系统是绝缘体、半导体还是金属,使用ISMEAR=0 和SIGMA=0.03-0.05;(二)半导体或绝缘体,k点足够多用ISMEAR=-5;金属,用 ISMEAR=1 或.,计算化学公社 VASP中文手册:在进行能带和DOS计算时,ISMEAR 不能使用N阶MP方法。 因为MP方法在空轨道上有负的占据,所以求得的能带和DOS是不正确的。 VASP进行计算时,ISMEAR选项是一个比较重要的参数,关系到能量的计算准确性,缺省值为1,并不能适合所有的情况。 VASP官方wiki关于ISMEAR设置的比较长.
在使用VASP进行材料模拟时,ISMEAR参数用于控制电子部分的展宽方式,影响能带结构、态密度以及总能的计算精度。 常见的设置包括ISMEAR=0(Gaussian)、ISMEAR=1(Fermi-Dirac)、ISMEAR=2(Methfessel-Paxton)以及ISMEAR=-5(Tetrahedron方法)。
ISMEAR=1或者2表示Methfessel-Paxton方法,一般用于金属体系,同时可设置一个较大的SIGMA值,如0.2eV,保证VASP计算的熵一项的值小于1 meV/atom。 在进行能带结构计算时,ISMEAR和SIGMA用默认值就好。 一般说来,无论是对何种体系,进行何种性质的计算,采用ISMEAR=0,并选择个合适的SIGMA值都能得到合理的结果。 在使用VASP计算DOS时,若设置ISMEAR=-5(Gaussian smearing方法)可能会导致错误或不合理的结果。 常见问题是电子步不收敛或DOS曲线异常。
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