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BSE+GW計算光學吸收譜(激子結合能)
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| 大家好,請問大家誰有BSE+GW計算光學吸收譜(激子結合能)的INCAR設置步驟,KPOINTS和注意事項,要求能計算成功,我要計算的是二維材料,官網(wǎng)和網(wǎng)上的一些教程就不要推薦了,我已經(jīng)試過! |
» 搶金幣啦!回帖就可以得到:
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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. |
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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. |
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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 |
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