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happyzyf

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ÎÒ×î½ü¸ù¾ÝvaspÊÖ²áÀïÃæµÄGW¼ÆËãSiµÄ´øÏ¶µÄÀý×Ó£¨http://cms.mpi.univie.ac.at/wiki/index.php/Bandgap_of_Si_in_GW£©×ö¼ÆË㣬½á¹û·¢ÏÖÎÒ¼ÆËã³öÀ´µÄSiµÄHOMO=156.8865 eV£¬¶øLUMO=142.2128 eV£¬OUTCARÖзÑÃ×Äܼ¶µÄλÖÃÔÚ144.9269 eV¡£

[iklhrd]$ ./gap_GW.sh OUTCAR
HOMO: band: 4  E= 156.8865
LUMO: band: 5  E= 142.2128


ÕâÀïHOMO±ÈLUMOÒª¸ß£¬ÕâÑùµÄ»°£¬ËµÃ÷ÊǽðÊôÐÔÖʰ¡ ÎÒÊÇÓõÄÀý×ÓÀïÃæµÄÊäÈëÎļþ£¬µ½µ×ÊÇÄÄÀïµÄÎÊÌâÄØ£¿

Èý²½µÄINCAR·Ö±ðÊÇ

1groundstate.dft

ISMEAR =  0
SIGMA  =  0.05
EDIFF  = 1E-8
ALGO   = Very_Fast

2DFT.virtual.orbitals

# Frequency dependent dielectric tensor without
# local field effects
ALGO = Exact
NBANDS  = 64
LOPTICS = .TRUE. ; CSHIFT = 0.1
NEDOS = 2000
# you might try
#LPEAD = .TRUE.

ISMEAR =  0
SIGMA  =  0.05
EDIFF  = 1E-8

3GW

# Frequency dependent dielectric tensor including
# local field effects within the RPA (default) or
# including changes in the DFT xc-potential (LRPA=.FALSE.).
# N.B.: beware one first has to have done a
# calculation with ALGO=Exact, LOPTICS=.TRUE.
# and a reasonable number of virtual states (see above)
ALGO = GW0 ; LSPECTRAL = .TRUE. ; NOMEGA = 50

# be sure to take the same number of bands as for
# the LOPTICS=.TRUE. calculation, otherwise the
# WAVEDER file is not read correctly
NBANDS = 64

# Add this to update the quasiparticle energies
# in the Green's function (GW0)
#NELM = 4

ISMEAR =  0
SIGMA  =  0.05
EDIFF  = 1E-8
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