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王夢ariel新蟲 (小有名氣)
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[求助]
castep中參數(shù)設(shè)置有個問題
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1、castep都是基于贗勢平面波進(jìn)行計算的嗎?它里面的基組都是平面波基組,只是通過計算的Energy cutoff去調(diào)節(jié)基組的大小進(jìn)行計算嗎?然后贗勢大小也等于截斷能量嗎? 2、看到一篇文獻(xiàn)中,有這樣一段描述,F(xiàn)or each structure, the cell parameters and atomic positions were relaxed using the density functional theory and the generalized gradient approximation (GGA) to the exchange- correlation functional as proposed by Perdew et al. (1996, PBE functional). The ionic cores were described by the ultrasoft pseudopotentials Fe.pbe-nd-rrkjus. UPF, O.pbe-rrkjus.UPF, H.pbe-rrkjus.UPF and the norm-conserving pseudopotential Al.pbe-rrkj.UPF from http://www.quantum-espresso.org. The wave-functions and the charge density were expanded in plane-waves with 40 and 480 Ry cutoffs, respectively (1 Ry = 13.606 eV). Increasing the wave-functions cutoff to 60 Ry does not change the total energy by more than 12 meV/atom and provides the same relative variations of the lattice parameters. For the electronic integration, the Brillouin zone was sampled according to the Monkhorst–Pack scheme (Monkhorst and Pack, 1976), using k-point grids consistent with the supercell dimensions. k-point grids of 4 4 4 and 2 2 4 were used for the 1 1 1 and 2 2 1 rhombohedral cells, respectively, while a 4 4 2 k-point grid was used for the hexagonal unit-cell. This number of kpoints is large enough to provide fully converged results. Atomic relaxations were performed with the PWscf code, 沒有搞清楚其中The wave-functions and the charge density were expanded in plane-waves with 40 and 480 Ry cutoffs, respectively (1 Ry = 13.606 eV).中是說電荷密度的的截斷能量是480Ry,還是什么? |
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