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BSE+GW計(jì)算光學(xué)吸收譜(激子結(jié)合能)
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| 大家好,請(qǐng)問大家誰有BSE+GW計(jì)算光學(xué)吸收譜(激子結(jié)合能)的INCAR設(shè)置步驟,KPOINTS和注意事項(xiàng),要求能計(jì)算成功,我要計(jì)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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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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•Step 2: compute additional DFT “virtual” orbitals (empty states) INCAR (copy INCAR.DIAG to INCAR): PREC = Normal ; ENCUT = 250 ALGO = Exact NELM = 1 Exact diagonalisation of the Hamiltonian Only 1 electronic step ISMEAR = 0 ; SIGMA = 0.01 NBANDS = 128 Keep 128 bands after diagonalisation LOPTICS = .TRUE. LPEAD = .TRUE. Compute derivative of the orbitals w.r.t. the Bloch wave vector (stored in the WAVEDER file) using the PEAD formalism OMEGAMAX = 40 N.B.: This calculation needs the orbitals (WAVECAR file) written in Step 1. |
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