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xijinyang

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# Crystalline Si : computation of few qpoints for
# electron and phonon's interaction

     ndtset  13

# DATASET 1:make GS_SCF wavefunctions and  density

    kptopt1  1
     
     prtwf1  1
    prtden1  1
    tolvrs1  1.0d-20
    getwfk1  0
    rfphon1  0
      nqpt1  0

# DATASET 2-13:make a RF calculation and get gkk and ddb
     qpt2   0.00000000E+00  0.00000000E+00  0.00000000E+00
     qpt3   2.50000000E-01  0.00000000E+00  0.00000000E+00
     qpt4   5.00000000E-01  0.00000000E+00  0.00000000E+00
     qpt5   0.00000000E+00  2.50000000E-01  0.00000000E+00
     qpt6   2.50000000E-01  2.50000000E-01  0.00000000E+00
     qpt7   5.00000000E-01  2.50000000E-01  0.00000000E+00
     qpt8  -2.50000000E-01  2.50000000E-01  0.00000000E+00
     qpt9   0.00000000E+00  5.00000000E-01  0.00000000E+00
     qpt10  2.50000000E-01  5.00000000E-01  0.00000000E+00
     qpt11  5.00000000E-01  5.00000000E-01  0.00000000E+00
     qpt12  2.50000000E-01  0.00000000E+00  2.50000000E-01
     qpt13  5.00000000E-01  0.00000000E+00  2.50000000E-01

   
#Common input variables
     
       nqpt  1
     kptopt  3
     rfphon  1
    rfatpol  1 4
      rfdir  1 1 1
     getwfk  1
    prepgkk  1
     prtgkk  1
      prtwf  1
     tolvrs  1.0d-8
       iscf  5
      ngkpt  16 16 16
    nshiftk  1
     shiftk  0.5 0.5 0.5

#Definition of the unit cell
    acell   3*10.217         
    rprim   0.0  0.5  0.5   
            1.0  0.0  1.0   
            0.5  0.5  0.0   
  chkprim   0
#Definition of the atom types
   ntypat   1         
   znucl   14  
                                                                                      
#Definition of the atoms
    natom   4         # There are four atoms
    typat   1 1 1 1      
                       
     xred   0.0  0.0  0.0
            0.25 0.25 0.25
            0.0  0.5  0.0
            0.25 0.75 0.25     

#Gives the number of band, explicitely (do not take the default)
    nband   20         

#Exchange-correlation functional

      ixc   1             # LDA Teter Pade parametrization

#Definition of the planewave basis set

     ecut   8.0           # Maximal kinetic energy cut-off, in Hartree

#Definition of the SCF procedure (dummy)
    nstep   300         
   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.
                        # The dielectric constant of AlAs is smaller that the one of Si (=12).
                         # SCF stopping criterion (dummy)

µ«ÊÇÔÚ×öµ½µÚ4¸ö×ÓÈÎÎñʱ£¬±¨´í£¬¾ßÌåµÄ.logÎļþµÄÊä³öÊÇ£º
scfcge: WARNING -
  Potential-based CG line minimization has trouble to converge.
  The algorithm is restarted with more secure parameters.
.
.
.
scfcge : ERROR -
  Potential-based CG line minimization not converged after 13 restarts.
  Action : read the eventual warnings about lack of convergence.
  Some might be relevant. Otherwise, raise nband.
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