Difference between revisions of "Explanations for Si sc pulse input files"
Line 143: | Line 143: | ||
It is possible to take two pulses simultaneously to simulate pump-probe experiments, adding information for two pulses. | It is possible to take two pulses simultaneously to simulate pump-probe experiments, adding information for two pulses. | ||
The time delay can be indicated using the variable 't1_t2'. | The time delay can be indicated using the variable 't1_t2'. | ||
+ | |||
+ | |||
+ | |||
+ | == &atomic_coor == | ||
+ | |||
+ | &atomic_coor | ||
+ | 'Si' .0 .0 .0 1 | ||
+ | 'Si' .25 .25 .25 1 | ||
+ | 'Si' .5 .0 .5 1 | ||
+ | 'Si' .0 .5 .5 1 | ||
+ | 'Si' .5 .5 .0 1 | ||
+ | 'Si' .75 .25 .75 1 | ||
+ | 'Si' .25 .75 .75 1 | ||
+ | 'Si' .75 .75 .25 1 | ||
+ | / | ||
+ | |||
+ | List of atomic coordinates. Last column corresponds to kinds of elements. |
Revision as of 11:28, 14 June 2017
Contents
Unit system
Hartree atomic units are used in this calculation by default.
&calculation
&calculation calc_mode = 'GS_RT' /
The variable calc_mode
is set to be 'GS_RT'
mode, which corresponds to execute the ground state (GS) and real-time (RT) calculation with single calculation task.
&control
&control sysname = 'Si' /
The variable sysname
is set to be 'Si'
, which is used as the filename prefix of the outputs.
&system
&system iperiodic = 3 al = 10.26d0,10.26d0,10.26d0 isym = 8 crystal_structure = 'diamond' nstate = 32 nelec = 32 nelem = 1 natom = 8 /
iperiodic = 3
indicates that three dimensional periodic boundary condition (bulk crystal) is assumed.
al = 10.26d0, 10.26d0, 10.26d0
specifies the lattice constans of the unit cell crystaline.
The variable isym
indicates the symmetry in the unit cell.
Considering the bulk silicon crystal with the applied electric field parallel to the one lattice axis, isym = 8
is preferred to speed up the calculation.
For more infomation, see Symmetry group of crystaline.
crystal_structure = 'diamond'
indicate the crystal structure of the considered material.
nstate = 32
indicates the number of Kohn-Sham orbitals to be solved.
nelec = 32
indicate the number of valence electrons in the system.
nelem = 1
and natom = 8
indicate the number of elements and the number of atoms in the system, respectively.
&pseudo
&pseudo iZatom(1)=14 pseudo_file(1) = './Si_rps.dat' Lloc_ps(1)=2 /
iZatom(1) = 14
indicates the atomic number of the element 1.
pseudo_file(1) = 'Si_rps.dat'
indicates the filename of the pseudopotential of element 1.
Lloc_ps(1) = 1
indicate the angular momentum of the pseudopotential that will be treated as local.
&functional
&functional xc ='TBmBJ' cval = 1d0 /
xc ='TBmBJ'
specifies the type of exchange correlation potential. The TBmBJ indicates a meta-generalized gradient approximation proposed by Tran and Blaha Phys. Rev. Lett. 102, 226401 (2009).
cval
specifies the additional parameter of the TBmBJ potential. In the case of the silicon, cval = 1d0
is prefered to reproduce the experimentally mesured optical constants.
&rgrid
&rgrid num_rgrid = 12,12,12 /
num_rgrid=12,12,12
specifies number of the real space grids for single crystal calculation.
&kgrid
&kgrid num_kgrid = 4,4,4 /
num_kgrid=4,4,4
specifies number of the k-space grids for single crystal calculation.
&tgrid
&tgrid nt=3000 dt=0.16 /
dt=0.16
sets the time step of the time-evolution calculations.
Nt=3000
indicates the number of time steps in the calculation.
&propagation
&propagation propagator='etrs' /
propagation='etrs'
specifies the numerical mathod of the time evolution of the wave function.
&scf
&scf ncg = 5 nscf = 120 /
ncg = 5
indicates the number of conjucate gradient step in the single scf calculation, and nscf = 120
specifies the number of the SCF step.
&emfield
&emfield trans_longi = 'tr' ae_shape1 = 'Acos2' rlaser_int1 = 1d14 pulse_tw1 = 441.195136248d0 omega1 = 0.05696145187d0 epdir_re1 = 0.,0.,1. /
ae_shape1 = 'Acos2'
specifies the pulse shape of the electric field, having cos-square envelope.
laser_int1
specifies maximum intensity of the applied electric field in unit of W/cm^2.
epdir_re1 = 0.d0,0.d0,1.d0
identifies the unit vector of polarization direction.
Specifying the real part of the polarization vector by 'epdir_re1', linear polarization is assumed.
Using both the real ('epdir_re1') and imaginary ('epdir_im1') parts of the polarization vector, circularly (and general ellipsoidally) polarized pulses may also be described.
omega1
specifies photon energy (frequency multiplied with hbar).
pulse_tw1
sets the pulse duration.
Note that it is not FWHM but a full duration of the sine-square envelope.
phi_cep1
specifies the carrier envelope phase of the pulse.
It is possible to take two pulses simultaneously to simulate pump-probe experiments, adding information for two pulses.
The time delay can be indicated using the variable 't1_t2'.
&atomic_coor
&atomic_coor
'Si' .0 .0 .0 1 'Si' .25 .25 .25 1 'Si' .5 .0 .5 1 'Si' .0 .5 .5 1 'Si' .5 .5 .0 1 'Si' .75 .25 .75 1 'Si' .25 .75 .75 1 'Si' .75 .75 .25 1
/
List of atomic coordinates. Last column corresponds to kinds of elements.