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hedge80金蟲 (小有名氣)
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[求助]
too many bands are not converged 已有1人參與
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剛學(xué)qe,在做si的能帶和聲子計算時沒有任何錯誤,但用si類似的輸入文件做ge和gaas時,碰到問題了。 輸入文件如下: +++++++++++++++++++++++++++++++ &control calculation = 'vc-relax' prefix = 'gaas' outdir = './outdir' pseudo_dir = '/home/work/pseudos' etot_conv_thr = 1e-5 forc_conv_thr = 1e-4 / &system ibrav = 2 celldm(1) = 10.9 nat = 2 ntyp = 2 ecutwfc = 50 ecutrho = 600 / &electrons conv_thr = 1.0e-14 / &ions / &cell cell_dofree = 'ibrav' / atomic_species ga 69.723 ga.pbe-dn-rrkjus_psl.1.0.0.upf as 74.9216 as.pbe-n-rrkjus_psl.1.0.0.upf atomic_positions (alat) ga 0.00 0.00 0.00 0 0 0 as 0.25 0.25 0.25 0 0 0 k_points (automatic) 12 12 12 0 0 0 +++++++++++++++++++++++++++++++ &control calculation = 'scf' prefix = 'gaas' outdir = './outdir' pseudo_dir = '/home/work/pseudos' etot_conv_thr = 1e-5 forc_conv_thr = 1e-4 / &system ibrav = 2 celldm(1) = 10.8704558116 nat = 2 ntyp = 2 ecutwfc = 50 ecutrho = 600 / &electrons conv_thr = 1.0e-14 / &ions / &cell cell_dofree = 'ibrav' / atomic_species ga 69.723 ga.pbe-dn-rrkjus_psl.1.0.0.upf as 74.9216 as.pbe-n-rrkjus_psl.1.0.0.upf atomic_positions (alat) ga 0.00 0.00 0.00 as 0.25 0.25 0.25 k_points (automatic) 12 12 12 1 1 1 ++++++++++++++++++++++++++++++++ &control calculation = 'nscf' prefix = 'gaas' outdir = './outdir' pseudo_dir = '/home/work/pseudos' etot_conv_thr = 1e-5 forc_conv_thr = 1e-4 / &system ibrav = 2 celldm(1) = 10.8704558116 nat = 2 ntyp = 2 ecutwfc = 50 ecutrho = 600 nbnd = 8 occupations = "tetrahedra' / &electrons conv_thr = 1.0e-14 / &ions / &cell cell_dofree = 'ibrav' / atomic_species ga 69.723 ga.pbe-dn-rrkjus_psl.1.0.0.upf as 74.9216 as.pbe-n-rrkjus_psl.1.0.0.upf atomic_positions (alat) ga 0.00 0.00 0.00 as 0.25 0.25 0.25 k_points (automatic) 12 12 12 1 1 1 ++++++++++++++++++++++++++ 前面兩步計算好像沒有問題,但到了nscf計算,就了出現(xiàn)不收斂的問題。"too many bands are not converged" 之前做ge的計算時,也出現(xiàn)一樣的問題,把贗勢從ge.pbe-dn-rrkjus_psl.1.0.0.upf改成ge.pbe-n-rrkjus_psl.1.0.0.upf就沒有問題, 計算結(jié)果也可以和教科書一致。這是什么原因呢? 盼高手給以解答。 另外,雖然使用ge.pbe-dn-rrkjus_psl.1.0.0.upf計算vc-relax時沒有出現(xiàn)問題,但迭代步數(shù)遠(yuǎn)多于使用ge.pbe-n-rrkjus_psl.1.0.0.upf。這是什么原因呢? |
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