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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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2¡¢ÕâÒ»¾ä²»ÖªËùÔÆ£º(to the number of the k-points used in the standard mesh PLUS the number of the k-points along the lines), ûÓÐÀí½âÔõô»ØÊ£¿



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[ Last edited by wuli8 on 2010-12-1 at 21:04 ]
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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,
Õâ¸öÊÇ˵°ÑÎÒÃÇÏëÒª¼ÆËãµÄÑØ¸ß¶Ô³Æ·½ÏòµÄKµã×Ô¼º¼Óµ½KPOINTSµÄĩβ²¿·Ö£¬ÎÊÌâÊÇ×Ô¼º¼ÆËãÕâЩKµãµÄ×ø±êÊÇÒ»¼þºÜÂé·³µÄÊÂÇ飬ÏñÊÇÓеãÄÜ´ø¼ÆËã¿ÉÄÜÐèÒª¼ÆËã°Ë¾ÅÊ®¸öKµã£¬ÕâÒªÊÇ×Ô¼ºÒ»¸öÒ»¸öËã×ø±ê£¬ÄǿɷѾ¢ÁË¡£ÎÒÃÇÖ®ËùÒÔÔÚVASP5.2֮ǰµÄ°æ±¾ÖÐʹÓõÄKPOINTSÎļþÖÐʹÓÃLine-modeģʽ£¬¾ÍÊÇÒòΪvasp¿ÉÒÔ¸ù¾ÝÎÒÃǸø³öµÄ¸ß¶Ô³Æµã£¬×ÔÐÐËã³öÕâЩKµãµÄ×ø±ê¡£
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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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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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ÒýÓûØÌû:
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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zzy870720z(½ð±Ò+2):ллָ½Ì 2010-12-04 21:36:29
wuli8(½ð±Ò+100):¸Ðл¡£ÎÒÔÙÊÔÒ»ÊÔ 2010-12-04 22:51:40
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