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【求助】怎么确定abinit计算能带结构的费米能位置
我想计算graphene的能带结构,然后就按教程的做了下,具体的输入文件是:
ndtset 2
#Dataset 1 : usual self-consistent calculation
kptopt1 1 # Option for the automatic generation of k points,
# taking into account the symmetry
nshiftk1 1
shiftk1 0.0 0.0 0.5 # These shifts will be the same for all grids
ngkpt1 36 36 1
prtden1 1 # Print the density, for use by dataset 2
tolvrs1 1.0d-20 # This value is way too large for most realistic studies of materials
nband1 16
occopt1 3
iscf1 7
#Dataset 2 : the band structure
iscf2 -2
getden2 -1
kptopt2 -3
nband2 16
ndivk2 15 15 15 # 10, 12 and 17 divisions of the 3 segments, delimited
# by 4 points.
kptbounds2 0.0 0.0 0.0 # gamma point
0.5 0.0 0.0 # M point
1/3 1/3 0.0 # K point
0.0 0.0 0.0 # Gamma point
tolwfr2 1.0d-12
enunit2 1 # Will output the eigenenergies in eV
#Definition of the unit cell
acell 4.6209 4.6209 9.44863
rprim 1.0 0.0 0.0 # The hexagonal axes
-0.5 0.8660 0.0
0.0 0.0 1.0
#Definition of the atom types
ntypat 1 # There is only one type of atom
znucl 6 # The keyword "znucl" refers to the atomic number of the
# possible type(s) of atom. The pseudopotential(s)
# mentioned in the "files" file must correspond
#Definition of the atoms
natom 2 # There are two atoms
typat 1 1
xred 2/3 1/3 0.0 # Triplet giving the REDUCED coordinate of atom 1.
1/3 2/3 0.0 # Triplet giving the REDUCED coordinate of atom 2.
#Definition of the planewave basis set
ecut 30.0 # Maximal kinetic energy cut-off, in Hartree
#Definition of the SCF procedure
nstep 100 # Maximal number of SCF cycles
diemac 12.0
计算完,我画的能带图如下:

可是我不知道fermi能在哪个位置?是在0点么?如果是0点的话,怎么我的dirac锥点位置比0点要高啊?是不是我参数设置有问题?
谢谢大家!非常感谢! |
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