# Crystalline silicon
#
# Computation of the band structure.
# First, a SCF density computation, then a non-SCF band structure calculation.

ndtset 2

#Definition of the unit cell
acell 3*10.195         # This is equivalent to   10.195 10.195 10.195
rprim  0.0  0.5  0.5   # FCC primitive vectors (to be scaled by acell)
       0.5  0.0  0.5
       0.5  0.5  0.0

#Definition of the atom types
ntypat 1          # There is only one type of atom
znucl 14          # 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
                  # to the type(s) of atom. Here, the only type is Silicon.
pp_dirpath "$ABI_PSPDIR"        # This is the path to the directory were
                                # pseudopotentials for tests are stored
pseudos "Pseudodojo_nc_sr_04_pw_standard_psp8/Si.psp8"

#Definition of the atoms
natom 2           # There are two atoms
typat 1 1         # They both are of type 1, that is, Silicon.
xred              # This keyword indicate that the location of the atoms
                  # will follow, one triplet of number for each atom
   0.0  0.0  0.0  # Triplet giving the REDUCED coordinate of atom 1.
   1/4  1/4  1/4  # Triplet giving the REDUCED coordinate of atom 2.

#Definition of the planewave basis set
ecut 12.0         # Maximal kinetic energy cut-off, in Hartree

#Definition of the SCF procedure
nstep 20          # Maximal number of SCF cycles
diemac 12.0       # Although this is not mandatory, it is worth to
                  # precondition the SCF cycle. The model dielectric
                  # function used as the standard preconditioner
                  # is described in the "dielng" input variable section.
                  # Here, we follow the prescription for bulk silicon.

#Dataset 1 : usual self-consistent calculation
kptopt1 1          # Option for the automatic generation of k points,
                   # taking into account the symmetry
nshiftk1 4
shiftk1  0.5 0.5 0.5  # These shifts will be the same for all grids
         0.5 0.0 0.0
         0.0 0.5 0.0
         0.0 0.0 0.5
ngkpt1  4 4 4
prtden1  1         # Print the density, for use by dataset 2
toldfe1  1.0d-6    # This value is way too large for most realistic studies of materials

#Dataset 2 : the band structure
iscf2    -2
getden2  -1
kptopt2  -3  # will have three segments in the band structure
nband2   8
ndivsm2   10   # 10 divisions of the smallest of the 3 segments, delimited
                       # by the 4 points defined by kptbounds.
kptbounds2  0.5  0.0  0.0 # L point
            0.0  0.0  0.0 # Gamma point
            0.0  0.5  0.5 # X point
            1.0  1.0  1.0 # Gamma point in another cell.
tolwfr2  1.0d-12
enunit2  1             # Will output the eigenenergies in eV

##############################################################
# This section is used only for regression testing of ABINIT #
##############################################################
#%%<BEGIN TEST_INFO>
#%% [setup]
#%% executable = abinit
#%% [files]
#%% files_to_test =
#%%   tbase3_5.abo, tolnlines=  0, tolabs=  0.000e+00, tolrel=  0.000e+00
#%% [paral_info]
#%% max_nprocs = 4
#%% [extra_info]
#%% authors = Unknown
#%% keywords =
#%% description =
#%%   Crystalline silicon
#%%
#%%   Computation of the band structure.
#%%   First, a SCF density computation, then a non-SCF band structure calculation.
#%%<END TEST_INFO>
