Back to the main page of this manual  Input reference of CP2K version 8.0 
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RI_G0W0
ANALYTIC_CONTINUATION {Keyword} 

Defines which type of analytic continuation for the self energy is used [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one keyword.  
Default value:
PADE 

List of valid keywords:

BSE {Logical} 

If true, electronic excitation energies are computed from the BetheSalpeter equation on top of GW eigenvalues. Parameter of BSE can be adjusted in the corresponding section. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 
CHECK_FIT {Logical} 

If true, the selfenergy on the imaginary axis and the fit are printedthe file self_energy_of_MO_ 

This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 
CORR_MOS_OCC {Integer} 

Number of occupied MOs whose energies are corrected by RIG0W0. Counting beginning from HOMO, e.g. 3 corrected occ. MOs correspond to correction of HOMO, HOMO1 and HOMO2. Numerical effort and storage of RIG0W0 increase linearly with this number. In case you want to correct all occ. MOs, insert a number larger than the number of occ. MOs. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
10 

Alias names for this keyword: CORR_OCC 
CORR_MOS_VIRT {Integer} 

Number of virtual MOs whose energies are corrected by RIG0W0. Counting beginning from LUMO, e.g. 3 corrected occ. MOs correspond to correction of LUMO, LUMO+1 and LUMO+2. Numerical effort and storage of RIG0W0 increase linearly with this number. In case you want to correct all virt. MOs, insert a number larger than the number of virt. MOs. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
10 

Alias names for this keyword: CORR_VIRT 
CROSSING_SEARCH {Keyword} 

Determines, how the self_energy is evaluated on the real axis. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one keyword.  
Default value:
NEWTON 

List of valid keywords:

EPS_ITER {Real} 

Target accuracy for the eigenvalue selfconsistency. If the G0W0 HOMOLUMO gap differs by less than the target accuracy during the iteration, the eigenvalue selfconsistency cycle stops. Unit: Hartree. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
1.36000000E003 

Default unit:
[eV]

EV_SC_ITER {Integer} 

Maximum number of iterations for eigenvalue selfconsistency cycle. The computational effort of GW scales linearly with this number. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
1 
FERMI_LEVEL_OFFSET {Real} 

Fermi level for occ. orbitals: e_HOMO + FERMI_LEVEL_OFFSET; Fermi level for virt. orbitals: e_LUMO  FERMI_LEVEL_OFFSET. In case e_homo + FERMI_LEVEL_OFFSET < e_lumo  FERMI_LEVEL_OFFSET, we set Fermi level = (e_HOMO+e_LUMO)/2. For cubicscaling GW, the Fermi level is always equal to (e_HOMO+e_LUMO)/2 regardless of FERMI_LEVEL_OFFSET. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
2.00000000E002 
GAMMA_ONLY_SIGMA {Logical} 

If true, the correlation selfenergy is only computed at the Gamma point. The Gamma point itself is obtained by averaging over all kpoints of the DFT mesh. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 

Alias names for this keyword: GAMMA 
IC_CORR_LIST {Real} ... or a range {Real}..{Real} 

List of image charge correction from a previous calculation to be applied in G0W0 or evGW. Keyword is active, if the first entry is positive (since IC corrections are positive occupied MOs. The start corresponds to the first corrected GW level. [Edit on GitHub]  
This keyword cannot be repeated and it expects a list of reals.  
Default value:
2.72113839E+001 

Default unit:
[eV]

IC_CORR_LIST_BETA {Real} ... or a range {Real}..{Real} 

IC_CORR_LIST for beta spins in case of open shell calculation. [Edit on GitHub]  
This keyword cannot be repeated and it expects a list of reals.  
Default value:
2.72113839E+001 

Default unit:
[eV]

IMAGE_CHARGE_MODEL {Logical} 

If true, an image charge model is applied to mimic the renormalization of electronic levels of a molecule at a metallic surface. For this calculation, the molecule has to be reflected on the desired xy image plane. The coordinates of the reflected molecule have to be added to the coord file as ghost atoms. For the ghost atoms, identical basis sets the normal atoms have to be used. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 

Alias names for this keyword: IC 
NPARAM_PADE {Integer} 

Number of parameters for the Pade approximation when using the latter for the analytic continuation of the self energy. 16 parameters (corresponding to 8 poles) are are recommended. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
16 
NUMB_POLES {Integer} 

Number of poles for the fitting. Usually, two poles are sufficient. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
2 
NUM_FREQ_POINTS_CLENSHAW_LOW_SCALING_GW {Integer} 

If this number is larger than NUM_INTEG_POINTS, then use a ClenshawCurtis grid for the frequency dependency of G, W and Sigma in lowscaling (imag. time) GW calculations. Putting more ClenshawCurtis points than minimax points is computationally more expensive, but doesn't affect the scaling and does improve the accuracy. Putting this parameter in normal N^4scaling GW calculation doesn't have any effect. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
1 
OMEGA_MAX_FIT {Real} 

Determines fitting range for the selfenergy on the imaginary axis: [0, OMEGA_MAX_FIT] for virt orbitals, [OMEGA_MAX_FIT,0] for occ orbitals. Unit: Hartree. Default: 0.734996 H = 20 eV. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one real.  
Default value:
7.34996000E001 
PERIODIC {Logical} 

If true, the periodic correction scheme is used employing kpoints. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 
PRINT_EXX {Keyword} 

Print exchange selfenergy minus exchange correlation potential for Gammaonly calculation (PRINT). For a GW calculation with kpoints we use this output as exchange selfenergy (READ). This is a temporary solution because the hybrid MPI/OMP parallelization in the HFX by Manuel Guidon conflicts with the parallelization in lowscaling GW kpoints which is most efficient with maximum number of MPI tasks and minimum number of OMP threads. For HFX by M. Guidon, the density matrix is fully replicated on every MPI rank which necessitates a high number of OMP threads per MPI rank for large systems to prevent out of memory. Such a high number of OMP threads would slow down the GW calculation severely. Therefore, it was decided to temporarily divide the GW kpoint calculation in a Gammaonly HF calculation with high number of OMP threads to prevent out of memory and a GW kpoint calculation with 1 OMP thread per MPI rank reading the previousHF output. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one keyword.  
Default value:
FALSE 

List of valid keywords:

RI_SIGMA_X {Logical} 

If true, the exchange selfenergy is calculated approximatively with RI. This is only recommended in case exact exchange is very costly, e.g. when using diffuse basis functions (seems not to work for periodic systems). [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one logical.  
The lone keyword behaves as a switch to
.TRUE. 

Default value:
.FALSE. 
SC_GW0_ITER {Integer} 

Maximum number of iterations for GW0 selfconsistency cycle. The computational effort of GW is not much affected by the number of scGW0 cycles. [Edit on GitHub]  
This keyword cannot be repeated and it expects precisely one integer.  
Default value:
1 
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