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我计算的锐钛矿相的TiO2的能带图和文献相差好多,主要是不理解我计算的能带偏离费米面很远的地方还有,而文献上就分布在费米面上下-10-10的距离,而我计算的在-30多和-50多还有,我这样的计算结果正确吗?应该怎么办?恳请各位大神指点。上传我计算的KPOINTS和INCAR文件。恳请大神帮我看看:
K-Path Generated by VASPKIT.
20
Line-Mode
Reciprocal
0.0000000000 0.0000000000 0.0000000000 GAMMA
0.0000000000 0.0000000000 0.5000000000 X
0.0000000000 0.0000000000 0.5000000000 X
0.2500000000 0.2500000000 0.2500000000 P
0.2500000000 0.2500000000 0.2500000000 P
0.0000000000 0.5000000000 0.0000000000 N
0.0000000000 0.5000000000 0.0000000000 N
0.0000000000 0.0000000000 0.0000000000 GAMMA
0.0000000000 0.0000000000 0.0000000000 GAMMA
0.5000000000 0.5000000000 -0.5000000000 M
0.5000000000 0.5000000000 -0.5000000000 M
0.2882989193 0.7117010807 -0.2882989193 S
-0.2882989193 0.2882989193 0.2882989193 S_0
0.0000000000 0.0000000000 0.0000000000 GAMMA
0.0000000000 0.0000000000 0.5000000000 X
-0.0765978387 0.0765978387 0.5000000000 R
0.5000000000 0.5000000000 -0.0765978387 G
0.5000000000 0.5000000000 -0.5000000000 M
Global Parameters
2 SYSTEM = primitive TiO2
3 ISTART = 1 (Read existing wavefunction; if there)
4 # ISPIN = 2 (Spin polarised DFT)
5 ICHARG = 11 (Non-self-consistent: GGA/LDA band structures)
6 LREAL = .FALSE. (Projection operators: automatic)
7 # ENCUT = 400 (Cut-off energy for plane wave basis set, in eV)
8 PREC = ACCURATE (Precision level)
9 LWAVE = .TRUE. (Write WAVECAR or not)
10 LCHARG = .TRUE. (Write CHGCAR or not)
11 ADDGRID= .TRUE. (Increase grid; helps GGA convergence)
12 # LVTOT = .TRUE. (Write total electrostatic potential into LOCPOT or not)
13 # LVHAR = .TRUE. (Write ionic + Hartree electrostatic potential into LOCPOT or not)
14 # NELECT = (No. of electrons: charged cells; be careful)
15 # LPLANE = .TRUE. (Real space distribution; supercells)
16 # NPAR = 4 (Max is no. nodes; don't set for hybrids)
17 # NWRITE = 2 (Medium-level output)
18 # KPAR = 2 (Divides k-grid into separate groups)
19 # NGX = 500 (FFT grid mesh density for nice charge/potential plots)
20 # NGY = 500 (FFT grid mesh density for nice charge/potential plots)
21 # NGZ = 500 (FFT grid mesh density for nice charge/potential plots)
22
23 Electronic Relaxation
24 ISMEAR = 0 (Gaussian smearing; metals:1)
25 SIGMA = 0.05 (Smearing value in eV; metals:0.2)
26 NELM = 60 (Max electronic SCF steps)
27 NELMIN = 6 (Min electronic SCF steps)
28 EDIFF = 1E-05 (SCF energy convergence; in eV)
29 # GGA = PS (PBEsol exchange-correlation)
30
31 Ionic Relaxation
32 NSW = 0 (Max ionic steps)
33 IBRION = 2 (Algorithm: 0-MD; 1-Quasi-New; 2-CG)
34 ISIF = 3 (Stress/relaxation: 2-Ions, 3-Shape/Ions/V, 4-Shape/Ions)
35 EDIFFG = -1E-02 (Ionic convergence; eV/AA)
36 # ISYM = 2
37 NEDOS = 2000 (Symmetry: 0=none; 2=GGA; 3=hybrids)
38 LORBIT = 11
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