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[交流] 【求助】band structures using hybrid functionals 的Kpoints问题

http://cms.mpi.univie.ac.at/vasp-forum/forum_viewtopic.php?4.6633.10
band structures using hybrid functionals have to be calculated the following way:
-) First perform a selfconsistent Hartree-Fock/HSE calculation using a conventional KPOINTS file.
-) Copy the IBZKPT file to KPOINTS, and explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, but set the weights of these added k-points to 0.
-) Do not forget to set the number of k-points in KPOINTS correctly (to the number of the k-points used in the standard mesh PLUS the number of the k-points along the lines), such that all k-points are used for the calculations.
-) NKRED can not be used.
-) Perform a second VASP run:
It is recommended to use the Davidson algorithm, since it converges that eigen energies at the new k-points fastest. Since VASP terminates when the total energy is converged to a certain threshold, it is important to force VASP to do a minimum number of steps, so that the orbitals at the new k-points are fully converged (note: since their weight is zero, they do not contribute to the total energy).
This can be done using e.g.

ALGO = N ; NELMIN = 5 ! Davidson, minimum 5 scf-steps
IBRION = 1 ! Use simple charge mixer, since
Pulay might blow up

-) The KS-eigenvalues of the states along the high-symmetry lines are written in OUTCAR, EIGENVAL, vasprun.xml; please cut the k-points required for the bandstructure from one of these files and proceed as usual (using p4vasp or any other graphics tool you usually use to produce bandstructure-plots)

Note: A Hartee-Fock calculation can NOT be continued from an existing CHGCAR file, since the non-local exchange is not determined by the charge density but by the density matrix and/or the KS-orbitals.


以上是官方给出的解释。


我的问题是:
1、-) Copy the IBZKPT file to KPOINTS, and explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, but set the weights of these added k-points to 0.
按照这样的方法产生的Kpoints运行后提示Kpoints错误,不能读取。
2、这一句不知所云:(to the number of the k-points used in the standard mesh PLUS the number of the k-points along the lines), 没有理解怎么回事?



请问谁用hse的方法计算过能带结构,请show一下下你的Kpoints。
谢谢。

[ Last edited by wuli8 on 2010-12-1 at 21:04 ]
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已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
我算的时候还是有提示K点设置有问题
5楼2011-03-11 00:08:02
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引用回帖:
Originally posted by jghe at 2010-12-04 21:15:41:
Automatically generated mesh
      57
Reciprocal lattice
  0.000000  0.000000  0.000000      1.000000
  0.333333  0.000000  0.000000      1.000000
-0.333333  0.000000  0.000000      1.000000
...

能不能给我个具体的例子任何体系都可以。谢谢
6楼2011-03-11 00:08:47
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引用回帖:
Originally posted by jghe at 2011-03-14 02:37:00:
什么提示啊,我给你的就是个例子

老是有这样的提示:

| |
| W W AA RRRRR N N II N N GGGG !!! |
| W W A A R R NN N II NN N G G !!! |
| W W A A R R N N N II N N N G !!! |
| W WW W AAAAAA RRRRR N N N II N N N G GGG ! |
| WW WW A A R R N NN II N NN G G |
| W W A A R R N N II N N GGGG !!! |
| |
| Your generating k-point grid is not commensurate to the symmetry |
| of the lattice. This can cause slow convergence with respect |
| to k-points for HF type calculations |
| suggested SOLUTIONS: |
| ) if not already the case, use automatic k-point generation |
| ) shift your grid to Gamma (G) (e.g. required for hex or fcc lattice) |
8楼2011-03-14 20:18:40
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Originally posted by jghe at 2011-03-14 02:37:00:
什么提示啊,我给你的就是个例子

我想要个计算好的例子。包含所有的输入和输出文件。
如果没有算个小的也可以。例如:纯diamond的能带结构,用HSE方法。
谢谢
9楼2011-03-14 20:22:26
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★ ★
zzy870720z(金币+2): 谢谢指教 2011-04-01 16:31:44
引用回帖:
Originally posted by 江湖之远 at 2011-03-31 21:31:26:
一楼的那个官方回复我有两点不太明白。
1)explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINT ...

回复你的问题2.
第一次运算是普通的DFT得到一个初始的波函数,第二个SCF是加上HSE的计算。这个HSE运算需要初始的波函数
13楼2011-04-01 15:46:24
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继续求助
15楼2011-09-26 15:58:46
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