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2011-04-15 17:52 ¡¾×ª¡¿ÓÃVASP½øÐÐPartial Charge·ÖÎöʵÀý
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µÚÒ»ÖÖPartial Charge·ÖÎöµÄINCAR
ISTART =      1    job   : 0-new 1-cont 2-samecut
ICHARG =      1   charge: 1-file 2-atom 10-const
LPARD=.TRUE.
IBAND= 20 21 22 23
KPUSE= 1 2 3 4
LSEPB=.TRUE.
LSEPK=.TRUE.
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µÚ¶þÖÖPartial Charge·ÖÎöµÄINCAR
ISTART =      1    job   : 0-new 1-cont 2-samecut
ICHARG =      1   charge: 1-file 2-atom 10-const
LPARD=.TRUE.
EINT = -10.3 -5.1
LSEPB=.FALSE.
LSEPK=.FALSE.
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µÚÈýÖÖPartial Charge·ÖÎöµÄINCAR
ISTART =      1    job   : 0-new 1-cont 2-samecut
ICHARG =      1   charge: 1-file 2-atom 10-const
LPARD=.TRUE.
NBMOD=-3
EINT = -1
LSEPB=.FALSE.
LSEPK=.FALSE.
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• LPARD: Evaluate partial (band and/or k-point) decomposed charge density. We want to stress again, that the
wavefunctions read from WAVECAR must be converged in a separate prior run. If only LPARD is set (and
none of the tags discussed below), the total charge density is evaluated from the wavefunctions and written
to CHGCAR.
• There are several ways how to specify for which bands the charge density is evaluated: In general the input
lines with IBAND, EINT and NBMOD control this respect of the routine:
• IBAND: Calculate the partial charge density for all bands specified in the array IBAND. If IBAND is specified
in the INCAR file and NBMOD is not given, NBMOD is set automatically to the size of the array. If IBAND is for
instance
IBAND= 20 21 22 23
the charge density will be calculated for bands 20 to 23.
• EINT: Specifies the energy range of the bands that are used for the evaluation of the partial charge density.
Two real values should be given, if only one value is specified, the second one is set to ǫf . If EINT is given
and NBMOD is not specified, NBMOD is set automatically to -2.
• NBMOD: This integer variable can take the following values
> 0 Number of values in the array IBAND. If IBAND is specified, NBMOD is set automatically to the correct
value (in that case NBMOD should not be set manually in the INCAR file)
0 Take all bands to calculate the charge density, even unoccupied bands are taken into account.
-1 Calculate the total charge density as usual. This is the default value if nothing else is given.
-2 Calculate the partial charge density for electrons with there eigenvalues in the range specified by EINT.
-3 The same as before, but the energy range is given vs. the Fermi energy.
• KPUSE: KPUSE specifies which k-points are used in the evaluation of the partial dos. KPUSE is an array of
integer values.
KPUSE= 1 2 3 4
means that the charge density is evaluated and summed for the first four k-points. Be careful: VASP changes
the kpoint weights if KPUSE is specified.
• LSEPB: Specifies whether the charge density is calculated for every band separately and written to a file
PARCHG.nb.⋆ (TRUE) or whether charge density is merged for all selected bands and write to the file
PARCHG.ALLB.⋆ or PARCHG. Default is FALSE.
• LSEPK: Specifies whether the charge density of every k-point is write to the files PARCHG.⋆.nk (TRUE) or
whether it is merged (FALSE) to a single file. If the merged file is written, then the weight of each k-point is
determined from the KPOINTS file, otherwise the kpoints weights of one are chosen.
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