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justinzhouke新蟲 (初入文壇)
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gamma點聲子虛頻 已有5人參與
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我在計算閃鋅礦結(jié)構(gòu)的InAs的gamma點頻率的時候,結(jié)算結(jié)果出奇的奇怪。具體如下: Diagonalizing the dynamical matrix q = ( 0.000000000 0.000000000 0.000000000 ) ************************************************************************** omega( 1) = -6.801498 [THz] = -226.873553 [cm-1] ( -0.502968 0.000000 -0.207252 0.000000 -0.106323 0.000000 ) ( 0.755263 0.000000 0.311212 0.000000 0.159655 0.000000 ) omega( 2) = -6.801498 [THz] = -226.873553 [cm-1] ( 0.147751 0.000000 -0.088266 0.000000 -0.526891 0.000000 ) ( -0.221864 0.000000 0.132541 0.000000 0.791185 0.000000 ) omega( 3) = -6.801498 [THz] = -226.873553 [cm-1] ( 0.180077 0.000000 -0.506449 0.000000 0.135339 -0.000000 ) ( -0.270406 0.000000 0.760490 -0.000000 -0.203226 0.000000 ) omega( 4) = -0.136566 [THz] = -4.555354 [cm-1] ( 0.006948 0.000000 -0.160492 0.000000 0.690824 0.000000 ) ( 0.006906 0.000000 -0.159518 0.000000 0.686631 0.000000 ) omega( 5) = -0.136566 [THz] = -4.555354 [cm-1] ( 0.617358 0.000000 0.341420 0.000000 0.073109 0.000000 ) ( 0.613612 0.000000 0.339348 0.000000 0.072665 0.000000 ) omega( 6) = -0.136566 [THz] = -4.555354 [cm-1] ( -0.349090 0.000000 0.600599 -0.000000 0.143042 0.000000 ) ( -0.346972 0.000000 0.596954 -0.000000 0.142174 0.000000 ) ************************************************************************** gamma點虛頻居然如此之大。我以及做了收斂性測試和結(jié)構(gòu)優(yōu)化。 但是為何gamma點虛頻居然如此之大?。誰能幫助我一下。 ![]() 輸入文件如下: scf: &control calculation = 'scf', restart_mode= 'from_scratch', pseudo_dir = './', outdir = './tmp', prefix='inas', tstress = .true. tprnfor = .true. / &system ibrav= 0, celldm(1)=11.450120305668, nat= 2, ntyp= 2, ecutwfc =48, / &electrons diagonalization='cg' mixing_mode = 'plain' mixing_beta = 0.7 conv_thr = 5.0d-12 / ATOMIC_SPECIES In 111.818 In.pbe-hgh.UPF As 74.920 As.pbe-hgh.UPF ATOMIC_POSITIONS crystal In 0.00 0.00 0.00 As 0.25 0.25 0.25 K_POINTS automatic 9 9 9 0 0 0 CELL_PARAMETERS alat 0.000000000 0.508881713 0.508881713 0.508881713 0.000000000 0.508881713 0.508881713 0.508881713 -0.000000000 ph: phonons of InAs &inputph tr2_ph=1.0d-14, prefix='inas', epsil=.true. amass(1) =111.818, amass(2) =74.920, outdir='./tmp', fildyn='inas.dyn', / 0.0 0.0 0.0 自恰輸出結(jié)果為: 。。。。 ! total energy = -16.65528050 Ry Harris-Foulkes estimate = -16.65528050 Ry estimated scf accuracy < 4.8E-12 Ry The total energy is the sum of the following terms: one-electron contribution = 1.42930748 Ry hartree contribution = 1.95307784 Ry xc contribution = -4.59653835 Ry ewald contribution = -15.44112747 Ry convergence has been achieved in 34 iterations Forces acting on atoms (Ry/au): atom 1 type 1 force = 0.00000000 0.00000000 0.00000000 atom 2 type 2 force = 0.00000000 0.00000000 0.00000000 Total force = 0.000000 Total SCF correction = 0.000000 entering subroutine stress ... total stress (Ry/bohr**3) (kbar) P= 0.00 0.00000001 0.00000000 0.00000000 0.00 0.00 0.00 0.00000000 0.00000001 -0.00000000 0.00 0.00 -0.00 0.00000000 -0.00000000 0.00000001 0.00 -0.00 0.00 。。。。 |

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