# default input parameters for siesta calculations
#PAO.BasisType           split       # split or splitgauss
#PAO.BasisSize           DZP         # basis set
PAO.SplitTailNorm       .true.      # Required for psml as noted in release note (default: false)
#XC.functional           GGA         # Exchange-correlation functional type
#XC.authors              PBE         # Particular parametrization of xc func
SpinPolarized           .false.     # Spin unpolarized calculation

# DFT, Grid
MeshCutoff              300. Ry     # Equivalent planewave cutoff for the grid
MaxSCFIterations        200         # Maximum allowed number of SCF iterations per electroinic step
SCFMustConverge         .false.      # continue to opt if fail to converge; Default value: .false.

# Kpoints
#
# Modify kgrid according to the structure
# for zeolite we use gamma point only
#KgridCutoff             0.0 bohr
%block kgridMonkhorstPack
# NOTE: the final . is important
2 0 0 0.
0 2 0 0.
0 0 1 0.
%endblock kgridMonkhorstPack

ElectronicTemperature   500 K       # Temp. for Fermi smearing, default is 300 K
#SolutionMethod          diagon      # diagon is more robust; ELSI is more efficient for larger system
# Parallelization over k-points the ELSI interface with the ELPA solver, only works for SIESTA compiled with ELSI enabled.
# For performance gains, see Fig 7 in doi: 10.1063/5.0005077
Solution.Method         ELSI
ELSI.Solver             ELPA
ELSI.ELPA.NSinglePrecision 200      # enable single precision mode, which could substantially save in CPU time
DM.Normalization.Tolerance 0.001    # (To avoid too stringent an intermediate check)

# SCF loop
#
SCF.DM.Tolerance        0.0008      # Default value: 10^−4
# SCF parameters for some difficult convergence cases
# see manual for details
%block SCF.Mixers
 init
 final
%endblock

%block SCF.Mixer.init
 method pulay
 weight 0.05
 history 30
 #restart 10
 restart.p 0.05
 restart.save 10
 # Switch when the relative residual goes below 2% or 20 cycles reached
 iterations 20
 next final
 next.p 0.02
%endblock

# increasing the weight and decreasing the history steps
%block SCF.Mixer.final
 method pulay
 weight 0.1
 history 20
 restart 30
%endblock

# Output options
WriteKpoints            .false.
WriteEigenvalues        .false.
WriteKbands             .false.
WriteBands              .false.
WriteMDhistory          .true.
WriteForces             .true.       # writes the atomic forces to the output file at every step
WriteCoorXmol           .true.       # save final structure in xyz format
WriteCoorCerius         .true.       # save in .xtl format for importing in material studio
WriteMDXmol             .true.       # check .ani file for trajectory

# Options for saving/reading information
DM.UseSaveDM            .true.       # read initial guess; Default value: .false.
MD.UseSaveXV            .false.      # Use stored positions and velocities
MD.UseSaveCG            .false.      # Use stored positions and velocities

# Molecular dynamics and geometry relaxations
MD.TypeOfRun            cg          # Type of dynamics: CG, Broyden, FIRE or MD
MD.VariableCell         .false.
MD.Steps                0           # single point (0) or opt
#MD.NumCGsteps          500         # deprecated in favor of MD.Steps
MD.MaxForceTol          0.04 ev/Ang # default value: 0.04 eV/Ang. set ftol to 0 to make sure SIESTA always write final force.
MD.MaxDispl             0.2 Bohr    # Default value: 0.2 Bohr