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三葉蟲的腳印新蟲 (初入文壇)
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[求助]
如果想要用4*4*4個(gè)q點(diǎn)計(jì)算一個(gè)四方晶系的聲子譜,q點(diǎn)應(yīng)該怎么設(shè)? 已有1人參與
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如果想要用4*4*4個(gè)q點(diǎn)計(jì)算一個(gè)四方晶系的聲子譜,q點(diǎn)應(yīng)該怎么設(shè)?還有提示中的問(wèn)題和虛頻問(wèn)題 輸入qua-relax.in #Number of data sets ndtset 2 #Dataset1:Initial self-consistent run getwfk1 0 # Cancel default kptopt1 1 #for the ground state iscf1 7 #Self-consistent calculation, using algorithm 7 tolvrs1 1.0d-18 #SCF stopping criterion #Dataset2:Response-function calculation, with q=0 getwfk2 -1 #Use GS wave functions from dataset1 kptopt2 2 #for response functions at q=0 iscf2 7 #Self-consistent calculation, using algorithm 5 rfphon2 1 #Will consider phonon-type perturbation rfatpol2 1 6 #All the atoms will be displaced rfdir2 1 1 1 #Along all reduced coordinate axis nqpt2 1 #One wavevector is to be considered ngqpt 4 4 4 tolvrs2 1.0d-22 #SCF stopping criterion #Common input variables acell 7.2673047890E+00 7.2673047890E+00 4.6380985420E+00 angdeg 90 90 90 ntypat 2 znucl 14 8 natom 6 typat 2*1 4*2 xred 0.0000000000E+00 0.0000000000E+00 0.0000000000E+00 5.0000000000E-01 5.0000000000E-01 5.0000000000E-01 2.9967303949E-01 2.9967303949E-01 1.3729447097E-18 2.0032696051E-01 7.9967303949E-01 5.0000000000E-01 7.0032696051E-01 7.0032696051E-01 -1.3729447097E-18 7.9967303949E-01 2.0032696051E-01 5.0000000000E-01 ecut 80 ngkpt 10 10 10 nshiftk 1 shiftk 0.5 0.5 0.5 nstep 100 #bands and occupation tsmear 0.02 # kptopt 1 diemac 12.0 ixc 1 optforces 1 chksymbreak 0 log文件中的提示: --- !WARNING src_file: distrb2.F90 src_line: 113 message: | nkpt*nsppol (75) is not a multiple of nproc_kpt (24) The k-point parallelisation is not efficient. ... --- !WARNING src_file: mpi_setup.F90 src_line: 622 message: | Your number of spins*k-points (=75) will not distribute correctly with the current number of processors (=24). You will leave some empty. YOU ARE STRONGLY ADVICED TO ACTIVATE AUTOMATIC PARALLELIZATION! PUT "AUTOPARAL=1" IN THE INPUT FILE. ... --- !WARNING src_file: m_hdr.F90 src_line: 3980 message: | input nkpt=500 not equal disk file nkpt=75 ... --- !WARNING src_file: m_hdr.F90 src_line: 4214 message: | input kptopt= 2 /= disk file kptopt= 1 ... ![]() --- !WARNING src_file: m_hdr.F90 src_line: 4509 message: | Restart of self-consistent calculation need translated wavefunctions. ... out文件中的虛頻。。 Phonon frequencies in cm-1 : - -1.704008E+02 1.012839E+01 1.398780E+01 1.398780E+01 4.443393E+02 - 5.406203E+02 5.406203E+02 7.389403E+02 7.902434E+02 7.902434E+02 - 8.843817E+02 8.843817E+02 9.283579E+02 1.058092E+03 1.066444E+03 - 1.180454E+03 1.180454E+03 1.298081E+03 小女子不才,初學(xué)ABINIT,望各路大牛海涵~ |
專家顧問(wèn) (著名寫手)
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專家經(jīng)驗(yàn): +174 |
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呃~現(xiàn)在可以直接用nqpt了么?記得以前老版本時(shí)的套路是先在kptopt = 1,nshiftk = 1,shiftk = (0,0,0)的情況下跑一個(gè)簡(jiǎn)單的scf,通過(guò)ngkpt得到q-mesh。 然后,再在計(jì)算聲子的輸入文件中,按照上一個(gè)計(jì)算中k點(diǎn)的量來(lái)設(shè)置ndtset,然后每個(gè)k點(diǎn)在本輸入文件中為qpt,每個(gè)qpt是一個(gè)單獨(dú)的聲子計(jì)算…… 另外,不排除一些計(jì)算在運(yùn)用asr之前有小的虛頻,所以還是需要anaddb處理之后看圖中是否存在虛頻,不過(guò)-170cm^(-1)的虛頻倒是不小…… |

新蟲 (小有名氣)
| 首先,有個(gè)基本的問(wèn)題,你在用格點(diǎn)法取k點(diǎn)和q點(diǎn)的時(shí)候,怎么能取ngkpt 10 10 10,ngqpt 4 4 4呢?這樣的話,在你取得聲子的格點(diǎn)上你計(jì)算電子了嗎?ngqpt的參數(shù)需要能整除ngkpt。第二,acell三個(gè)值不相等,格點(diǎn)怎么能取10 10 10,4 4 4了?第三,rf計(jì)算能用iscf=7嗎?第四,聲子計(jì)算的時(shí)候似乎應(yīng)該考慮參數(shù)nline?這個(gè)我也不是很清楚。至于報(bào)錯(cuò)似乎是個(gè)并行運(yùn)算問(wèn)題,不過(guò)你先把上面的問(wèn)題改好試試?樓上說(shuō)的方法在現(xiàn)在的版本也能用來(lái)作為參考的。 |
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