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[求助]
想要得到平滑一些的DOS
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| 各位,想要把dos做的平滑些,我用做金屬表面吸附有機分子體系,ISMEAR=-5,NEDOS=1001,出來的峰比較尖,很是難看,請教大家有什么好辦法把它搞得平滑些,有人說NEDOS取大些,有人說取小些,還有人說ISMEAR取1或者0,那種方法好一些,請各位賜教!多謝了! |
first principle |
金蟲 (小有名氣)

金蟲 (小有名氣)
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Mind: Avoid using ISMEAR>0 for semiconductors and insulators, since this often leads to incorrect results (The occupancies of some states might be larger or smaller than 1). For insulators use ISMEAR=0 or ISMEAR=-5. The Gaussian smearing (GS) method leads in most cases also to reasonable results. Within this method it is necessary to extrapolate from finite SIGMA results to SIGMA=0 results. You can find an extra line in the OUTCAR file ’energy( SIGMA → 0)’ giving the extrapolated results. Large SIGMA values lead to a similar error as the MP scheme, but in contrast to the MP scheme one can not determine, how large the error due to the smearing is with systematically reducing SIGMA. Therefore the method of MP is more convenient than the GS method. In addition, in the GS method forces and the stress tensor are consistent with the free energy and not the energy for SIGMA → 0. Overall the Methfessel-Paxton is easier to use for metallic systems. |

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還是上段話: The Gaussian smearing (GS) method leads in most cases also to reasonable results. Within this method it is necessary to extrapolate from finite SIGMA results to SIGMA=0 results. You can find an extra line in the OUTCAR file ’energy( SIGMA → 0)’ giving the extrapolated results. Large SIGMA values lead to a similar error |

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