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[交流]
【其他】關(guān)于GW（準(zhǔn)粒子計算能帶結(jié)構(gòu)等）方法的工作 已有6人參與
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想做關(guān)于準(zhǔn)粒子計算能帶，激發(fā)態(tài)，光譜等的工作，大家討論下，這個算起來是不是很費(fèi)勁？目前能算準(zhǔn)粒子的軟件可算多大體系？ 另外這方面工作少的原因是不是和計算很耗時間有關(guān)系？ 謝謝大家指點(diǎn)討論！ |
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★ ★
子虛烏有5388(金幣+1): 2010-08-08 18:26:05
zzy870720z(金幣+2):謝謝分享 2010-08-08 18:47:40
子虛烏有5388(金幣+1): 2010-08-08 18:26:05
zzy870720z(金幣+2):謝謝分享 2010-08-08 18:47:40
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我看到過一個計算的例子 ， 貼給大家看看。 ------------------------------------------------------------------------- GW Band Structure Plots To obtain band structure plots from the GW method, first you have to perform a DFT calculation. The INCAR file I used for DFT on Si looks like this: ISTART = 0 ISYM = 0 ICHARG = 2 ISMEAR = 0 SIGMA = 0.1 LORBIT = 11 NSW = 200 IBRION = 2 ISIF = 3 EDIFF = 0.0001 EDIFFG = -0.01 KPOINTS file for the run is: Monkhorst Pack 0 Gamma 4 4 4 0 0 0 POSCAR file is: Si 5.38936000000000 0.5000000000000000 0.5000000000000000 0.0000000000000000 0.0000000000000000 0.5000000000000000 0.5000000000000000 0.5000000000000000 0.0000000000000000 0.5000000000000000 2 Direct 0.0000000000000000 0.0000000000000000 0.0000000000000000 0.2500000000000000 0.2500000000000000 0.2500000000000000 POTCAR file is supplied with VASP 5.2, remember to use paw pseudopotentials so that in the band structure calculation the Wigner-Seitz radius for Si need not be directly specified in INCAR. After this run completes you are ready to perform the HF-type (HSE06) calculation. Change the INCAR file to: ISTART = 1 ICHARG = 2 EDIFF = 0.0001 EDIFFG = -0.01 ENCUT = 400 ENAUG = 800 LREAL = .FALSE. LWAVE = .TRUE. LCHARG = .TRUE. NELM = 200 NSW = 0 IBRION = -1 LMAXMIX = 4 ISMEAR = 0 SIGMA = 0.1 NSIM = 4 IALGO = 48 ISYM = 0 LHFCALC = .TRUE. HFSCREEN = 0.2 ALGO = Damped TIME = 0.4 ENCUTFOCK = 0 NKRED = 2 AEXX = 0.25 Keep the other files constant for this run (e.g. KPOINTS, POSCAR, POTCAR need not be changed). Once this run has completed, add to the bottom of the INCAR file from the HSE06 calculation: LOPTICS = .TRUE. This step calculates the dielectric matrix Once this run has completed, change ALGO = Damped to ALGO = Gwo and ICHARG = 2 to ICHARG = 11 and add: NOMEGA = 50 ENCUTGW = 100 LORBIT = 11 and change the KPOINTS file to: k-points along high symmetry lines 20 ! 20 intersections Line-mode rec 0 0 0 ! gamma 0.5 0.0 0 ! X 0.5 0.0 0 ! X 0.5 0.5 0.0 ! M 0.5 0.5 0.0 ! M 0.0 0.0 0.0 ! gamma 0.0 0.0 0.0 ! gamma 0.5 0.5 0.0 ! M 0.5 0.5 0.0 ! M 0.5 0.5 0.5 ! R 0.5 0.5 0.5 ! R 0.0 0.0 0.0 ! gamma These values are the points of high symmetry along the lines of high symmetry within the first Brillouin Zone of the Si unit cell structure in reciprocal space. And that’s it! Once complete you can plot the PROCAR, EIGENVAL, and DOSCAR files from the output of this run as described in the previous posts. The band structure plot produced from the plotting utility is shown below. --------------------------------------------------------------- |
7樓2010-08-08 12:35:34
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