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shijing879

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[交流] BSE+GW计算光学吸收谱(激子结合能)

大家好,请问大家谁有BSE+GW计算光学吸收谱(激子结合能)的INCAR设置步骤,KPOINTS和注意事项,要求能计算成功,我要计算的是二维材料,官网和网上的一些教程就不要推荐了,我已经试过!
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wangyikeco

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Step 3: RPA quasiparticles: single-shot GW (G0W0)
INCAR (copy INCAR.GW0 INCAR):

PREC = Normal ; ENCUT = 250
ALGO = GW0 ; NELM = 1 Request G0W0 calculation
ISMEAR = 0 ; SIGMA = 0.01
ENCUTGW = 150
NOMEGA = 50
OMEAGTL = 280
PRECFOCK = Normal
Eenergy cutoff for response functions
Number of points for frequency integration
NBANDS = 128 Use the same #-of-bands as in Step 2., otherwise the
WAVEDER file can not be read correctly
NBANDSGW = 12 Compute QP energies only for the first 12 bands
KPAR = 2
LWAVE = .TRUE. Write WAVECAR (contains QP-energies)

N.B.: This calculation needs the orbitals (WAVECAR file) , and the derivative of
the orbitals w.r.t. the Bloch wave vectors (WAVEDER file) written in Step 2.
10楼2023-08-29 03:03:57
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wangyikeco

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shijing879(金币+1): 谢谢参与
VASP sucks!

Goal: account for excitonic effects in the frequency dependent dielectric function
• GW0+BSE: Solve the Bethe-Salpeter-Equation on top of GW0
WORKFLOW of a GW0+BSE calculation
The workflow of the GW0+BSE calculation in job.sh consists of five consecutive steps:
Step 1: a “standard" DFT groundstate calculation
Step 2: compute additional DFT “virtual” orbitals (empty states):
• Needs the WAVECAR from Step 1.
Step 3: the GW0 calculation:
• Needs the WAVECAR and WAVEDER files from Step 2.
Step 4: (optional) use LOPTICS=.TRUE. to plot the IPA dielectric function using
the GW0-QP energies instead of DFT eigenenergies
• Needs the WAVECAR file from Step 3.
Step 5: the BSE calculation:
• Needs WAVECAR file from Step 3 and WAVEDER file from Step 2.
6楼2023-08-28 10:16:03
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shijing879

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引用回帖:
6楼: Originally posted by wangyikeco at 2023-08-28 10:16:03
VASP sucks!

Goal: account for excitonic effects in the frequency dependent dielectric function
• GW0+BSE: Solve the Bethe-Salpeter-Equation on top of GW0
WORKFLOW of a GW0+BSE calculation
...

这些我都知道,请问是否有每一步具体的INCAR,KPOINTS, Thanks in advance!
7楼2023-08-28 15:48:51
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wangyikeco

木虫 (正式写手)


引用回帖:
7楼: originally posted by shijing879 at 2023-08-28 15:48:51
这些我都知道,请问是否有每一步具体的incar,kpoints, thanks in advance!...

Step 1: a “standard” DFT groundstate calculation
KPOINTS (e.g. KPOINTS.6):
6x6x6
0
G
6 6 6
0 0 0
INCAR (copy INCAR.DFT to INCAR):
PREC = Normal
ENCUT = 250
Default
Set cutoff energy to 250 eV
ISMEAR = 0
SIGMA = 0.01
Gaussian smearing
Set small smearing width
KPAR = 2 Additional parallelization
EDIFF = 1.E-8 Set tight convergence criterium
8楼2023-08-29 02:56:10
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toppaper3楼
2023-08-27 16:11   回复  
shijing879(金币+1): 谢谢参与
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