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[½»Á÷] ¡¾ÇóÖú¡¿band structures using hybrid functionals µÄKpointsÎÊÌâ

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.


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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.
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[ Last edited by wuli8 on 2010-12-1 at 21:04 ]
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zzy870720z(½ð±Ò+2):ллָ½Ì 2010-12-04 21:36:29
wuli8(½ð±Ò+100):¸Ðл¡£ÎÒÔÙÊÔÒ»ÊÔ 2010-12-04 22:51:40
Automatically generated mesh
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4Â¥2010-12-04 21:15:41
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vimtex

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show your KPOINTS instead.
2Â¥2010-12-02 00:00:21
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282926214

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Originally posted by vimtex at 2010-12-02 00:00:21:
show your KPOINTS instead.

IBZKPT
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3Â¥2010-12-02 08:37:51
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5Â¥2011-03-11 00:08:02
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Originally posted by jghe at 2010-12-04 21:15:41:
Automatically generated mesh
      57
Reciprocal lattice
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  0.333333  0.000000  0.000000      1.000000
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...

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6Â¥2011-03-11 00:08:47
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jghe

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Originally posted by wuli8 at 2011-03-11 00:08:47:
Äܲ»ÄܸøÎÒ¸ö¾ßÌåµÄÀý×ÓÈκÎÌåϵ¶¼¿ÉÒÔ¡£Ð»Ð»

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7Â¥2011-03-14 02:37:00
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Originally posted by jghe at 2011-03-14 02:37:00:
ʲôÌáʾ°¡£¬ÎÒ¸øÄãµÄ¾ÍÊǸöÀý×Ó

ÀÏÊÇÓÐÕâÑùµÄÌáʾ£º

| |
| 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) |
8Â¥2011-03-14 20:18:40
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Originally posted by jghe at 2011-03-14 02:37:00:
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9Â¥2011-03-14 20:22:26
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TIGERYZZ

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10Â¥2011-03-14 21:58:20
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215215

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Originally posted by wuli8 at 2011-03-11 00:08:47:
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11Â¥2011-03-24 15:55:29
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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 KPOINTS file,
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2) Perform a second VASP run: ÔÚÕâ¸ö·½·¨ÖÐ×ÔÇ¢Ô¤ËãÐèÒªÔËÐÐÁ½±é£¬ÄÇÎÒÏëÖªµÀµÚÒ»±é×ÔÇ¢ÔËËãµÄ×÷ÓÃÊÇʲô£¿ÎÒµÄÏë·¨ÊÇ£ºÈç¹ûÎÒµÄKPOINTSÎļþÊÂÏȾͰ´ÕÕËûÉÏÃæËù˵µÄ³ÌÐò¶¼ÉèÖúÃÁË£¨¼´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. £©£¬ÄÇÎÒÊDz»ÊÇÖ±½ÓÔËÐÐÒ»±é×ÔÇ¢ÔËËã¾Í¿ÉÒԵóö½á¹û£¬²»ÐèÒªÏñһ¥Ëù˵µÄÄÇÑù½øÐÐÁ½±éÔËË㣬ÒòΪ±Ï¾¹Õâ¸öÔËËãÊÇÏ൱ºÄʱ¼äµÄ¡£
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zzy870720z(½ð±Ò+2): ллָ½Ì 2011-04-01 16:31:44
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Originally posted by ½­ºþÖ®Ô¶ at 2011-03-31 21:31:26:
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13Â¥2011-04-01 15:46:24
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zzy870720z(½ð±Ò+2): ллָ½Ì 2011-04-02 14:14:00
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Originally posted by wuli8 at 2011-04-01 15:46:24:
»Ø¸´ÄãµÄÎÊÌâ2.
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[ Last edited by ½­ºþÖ®Ô¶ on 2011-4-2 at 09:45 ]
14Â¥2011-04-02 09:35:22
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15Â¥2011-09-26 15:58:46
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robinson8607

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1882049Â¥: Originally posted by ½­ºþÖ®Ô¶ at 2011-04-02 09:35:22
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16Â¥2012-07-25 20:59:00
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future_wl

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1882049Â¥: Originally posted by ½­ºþÖ®Ô¶ at 2011-04-02 09:35:22
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17Â¥2013-03-18 09:37:05
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gaozhibin

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Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
ÒýÓûØÌû:
8Â¥: Originally posted by wuli8 at 2011-03-14 20:18:40
ÀÏÊÇÓÐÕâÑùµÄÌáʾ£º

| |
| 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 ...

ÀÏÊÇÓÐÕâÑùµÄÌáʾ£º

| |
| 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) |



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18Â¥2015-11-22 15:54:18
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xujing15

гæ (³õÈëÎÄ̳)


¡ï
Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
ÒýÓûØÌû:
4Â¥: 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
  ...

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19Â¥2017-04-03 22:15:01
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