Fcc Si DOS: Difference between revisions
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{{Template:Bulk_systems}} | {{Template:Bulk_systems - Tutorial}} | ||
== Task == | == Task == | ||
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== Input == | == Input == | ||
=== {{ | === {{FILE|POSCAR}} === | ||
fcc Si: | fcc Si: | ||
3.9 | 3.9 | ||
| Line 17: | Line 17: | ||
0 0 0 | 0 0 0 | ||
=== {{ | === {{FILE|INCAR}} === | ||
{{TAGBL|System}} = fcc Si | {{TAGBL|System}} = fcc Si | ||
# {{TAGBL|ICHARG}} = 11 #charge read file | # {{TAGBL|ICHARG}} = 11 #charge read file | ||
| Line 24: | Line 24: | ||
{{TAGBL|LORBIT}} = 11 | {{TAGBL|LORBIT}} = 11 | ||
=== {{ | === {{FILE|KPOINTS}} === | ||
k-points | k-points | ||
0 | 0 | ||
| Line 30: | Line 30: | ||
21 21 21 | 21 21 21 | ||
0 0 0 | 0 0 0 | ||
== Calculation == | == Calculation == | ||
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rm dos.dat plotfile | rm dos.dat plotfile | ||
</pre> | </pre> | ||
[[File:Fig Si 4.png|600px]] | |||
== Download == | == Download == | ||
[ | [[Media:FccSidos.tgz| fccSidos.tgz]] | ||
{{Template:Bulk_systems}} | |||
[[Category:Examples]] | [[Category:Examples]] | ||
Latest revision as of 13:24, 14 November 2019
Overview > fcc Si > fcc Si DOS > fcc Si bandstructure > cd Si > cd Si volume relaxation > cd Si relaxation > beta-tin Si > fcc Ni > graphite TS binding energy > graphite MBD binding energy > graphite interlayer distance > List of tutorials
Task
Calculation of the DOS in fcc Si.
Input
POSCAR
fcc Si: 3.9 0.5 0.5 0.0 0.0 0.5 0.5 0.5 0.0 0.5 1 cartesian 0 0 0
INCAR
System = fcc Si # ICHARG = 11 #charge read file ENCUT = 240 ISMEAR = -5 #tetrahedron LORBIT = 11
KPOINTS
k-points 0 Monkhorst Pack 21 21 21 0 0 0
Calculation
- Perform a static (NSW=0, IBRION=-1) self consistent calculation for the DOS (the DOS is found in the DOSCAR file.
- For large systems:
- Read CHGCAR from previous run. To copy the self-consistent charge density of example fcc_Si to your current working
directory (assumed to be fccSidos), type: $ cp ../fccSi/CHGCAR . You must do this otherwise VASP can not read the CHGCAR and will terminate.
- The smearing of the k points is set to the tetrahedron method with Blöchl corrections (ISMEAR=-5 to fi the problem
- To plot the DOS use p4vasp:
- Alternatively the bash-script plotdos.sh invokes awk and gnuplot to get the DOS from the vasprun.xml file and plot it.
awk 'BEGIN{i=1} /dos>/,\
/\/dos>/ \
{a[i]=$2 ; b[i]=$3 ; i=i+1} \
END{for (j=12;j<i-5;j++) print a[j],b[j]}' vasprun.xml > dos.dat
ef=`awk '/efermi/ {print $3}' vasprun.xml`
cat >plotfile<<!
# set term postscript enhanced eps colour lw 2 "Helvetica" 20
# set output "optics.eps"
plot "dos.dat" using (\$1-$ef):(\$2) w lp
!
gnuplot -persist plotfile
rm dos.dat plotfile
