||
参考: http://www.cohp.de/
一,安装;
直接拷贝二进制文件lobster-3.0.0到~/bin/目录下,可以直接调用;
二,VASP计算设置:
使用默认版本的VASP,不使用gamma版本;
使用PAW赝势;
删除原有波函数文件;
做静态计算,NSW=0,ISIF=0;
关闭对称性,ISYM=-1;
NBANDS设置为总价电子数或更高;如果结果不理想,再进行调整;
总结:在自洽计算的INCAR中加入以下参数:NBANDS,ISYM;KPOINTS采用规则MP网格不变
三,Lobster运行及设置
~/bin/lobster,直接运行;
该程序自动并行,不能跨节点并行;
LOBSTER输入文件:lobsterin. 举例如下:
COHPstartEnergy -14 !能量窗口,以费米能级为0
COHPendEnergy 6
basisfunctions Ga 4s 4p 3d !POTCAR中每种原子的价电子轨道
basisfunctions As 4s 4p
cohpbetween atom 1 and atom 2 !计算第一个原子与第二个原子的COHP
也可以使用:
cohpGenerator from 1.4 to 1.5 type Ga type As ! 计算所有Ga-As键长小于1.5大于1.4的键。
4. 输出文件格式详见手册。
COHPCAR.lobster: File that contains the pCOHPs as requested in the lobsterin file.
It resembles the format of TB-LMTO-ASA’s COPL file, which is organized as follows:
- Starting in line 3, the labels for the interactions are presented, followed by the
actual data.
- Column 1: energy axis, shifted such that the Fermi level lies at zero eV.
- Column 2: pCOHP averaged over all atom pairs specified
- Column 3: integrated pCOHP (IpCOHP) averaged over all atom pairs
- Column 4: pCOHP of the first interaction
- Column 5: IpCOHP of the first interaction
- and so on...
Note that in a spin-polarized calculation, the first set of the columns (2, 3, …, 2N+3)
belongs to the first (up) spin and the other set (2N+4, 2N+5, …, 4N+5) belongs to the
second (down) spin. Here N is the number of interactions.
5. 画图:
通常文献中用的是-COHP,才能使得成键态为正,反键态为负数,所以处理结果时需将结果乘以-1;
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