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Posted: **Mon May 09, 2016 12:57 pm**

Hi,

I've encountered this error while trying to perform a GW calculation with LSORBIT turned on:

internal error in VASP:  XI_COULOMB new method for calculating NQ is not correct

I've followed the VASP recipe for GW calculations more or less exactly, except with the addition of LSORBIT = .TRUE.

A pared down version of my INCAR that reproduces the error is:

Code: Select all

SYSTEM = GW density of states

start Parameters
  ICORELEVEL = 1
  NBANDS     = 352

parallelisation
  NCORE  = 12
  KPAR   = 8
  
electronic relaxation
  PREC     = Accurate
  ENMAX    = 350
  NELM     = 1
  EDIFF    = 1E-7
  LASPH    = .TRUE.
  ALGO     = GW0
  GGA      = PE
  PRECFOCK = Fast
  ENCUTGW  = 100

misc
  ISYM    = 0
  ISMEAR  = 0
  SIGMA   = 0.05
  NEDOS   = 1000
  LORBIT  = 11
  LVHAR   = .TRUE.
  LSORBIT = .TRUE.
  LOPTICS = .TRUE.

This G0W0 calculation is being run on preconverged WAVECAR and WAVEDIR files, as per the GW recipe.

What could be causing this error?

Posted: **Wed Mar 29, 2017 10:13 am**

Hi,

I also encounter this error
internal error in VASP: XI_COULOMB new method for calculating NQ is not correct
while trying to do a GW0 calculation with VASP 5.4.1 version. I do not use LSORBIT.

Have you a solution for this problem ?

Thanks,
Franck

Posted: **Thu Apr 12, 2018 11:45 am**

The problem also exists in 5.4.4

INCAR is as such:

Code: Select all

PREC = accurate
ENCUT = 350
EDIFF = 1E-07
EDIFFG = -1E-03
LREAL = Auto
ISYM = 0        
ISPIN = 1

IVDW = 12       #D3BJ

ISMEAR = 0
SIGMA = 0.05

LPLANE = .TRUE.

NWRITE = 2
LWAVE = F
LCHARG = F
LVTOT = F

NBANDS = 48
LOPTICS = .TRUE.
CSHIFT = 0.1
ALGO = GW0
LSPECTRAL = T
NOMEGA = 50
MAXMEM = 127000

Posted: **Sun May 31, 2020 3:33 pm**

Also encountered this error. Any suggestions? Thanks

Posted: **Sun May 31, 2020 4:05 pm**

I was doing GW calculation by explicitly writing out k-points in KPOINTS file using vasp5.4.4 and encountered this problem:
internal error in VASP: XI_COULOMB new method for calculating NQ is not correct

Is it ever possible to write out k-points in GW mode in VASP? I know I can do 4x4x4, etc.

Posted: **Tue Jun 09, 2020 6:41 am**

Please upload your calculation according to the forum guidelines, then we can have a look at it properly.

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