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donggaomin

金虫 (正式写手)

[求助] 如何理解VASP计算得的极化P的数据?请计算过极化的同行赐教

请看一下下面所列数据 "ionic dipole moment: p" 中的Z 的值,应变从0.0到变化0.01到0.015的过程中,这个Z值从  -112.50058变化到94.108到94.4635。从负到变为正值说明了什么?

(极化量子eR/V约为:180  uc/cm^2)

外加应变为0.0,   IGPAR =1
Total electronic dipole moment: p[elc]=(     0.59507     0.00108     0.91961 )
  ionic dipole moment: p[ion]=(     0.00000     0.00000  -112.50058 ) e*Angst

IGPAR =2
Total electronic dipole moment: p[elc]=(    -0.29660     0.51589     0.91961 )
ionic dipole moment: p[ion]=(     0.00000     0.00000  -112.50058 ) e*Angst

IGPAR =3
Total electronic dipole moment: p[elc]=(    -0.29660    -0.51589     0.91961 )
ionic dipole moment: p[ion]=(     0.00000     0.00000  -112.50058 ) e*Angst


外加应变为0.01,   IGPAR =1
  Total electronic dipole moment: p[elc]=(     0.64514     0.00079     1.00435 )
ionic dipole moment: p[ion]=(     0.00000     0.00000    94.10800 ) e*Angst

IGPAR =2
Total electronic dipole moment: p[elc]=(    -0.32189     0.55910     1.00435 )
ionic dipole moment: p[ion]=(     0.00000     0.00000    94.10800 ) e*Angst

IGPAR =3
Total electronic dipole moment: p[elc]=(    -0.32189    -0.55910     1.00435 )
ionic dipole moment: p[ion]=(     0.00000     0.00000    94.10800 ) e*Angst


外加应变为0.015,   IGPAR =1
Total electronic dipole moment: p[elc]=(     0.65196     0.00066     1.01989 )
ionic dipole moment: p[ion]=(     0.00000     0.00000    94.46350 ) e*Angst
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dhc198611

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【答案】应助回帖

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donggaomin(金币+20): 谢谢!请问这个“一个周期内”,这个周期内的范围是否是通过玻恩有效电荷来决定? 2011-10-02 10:37:18
youzhizhe(金币+1): 谢谢交流。 2011-10-02 12:35:10
说明出现了一个模,要减回到一个周期内
科研无止境
2楼2011-10-02 08:04:59
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dhc198611

木虫 (小有名气)

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zzy870720z(金币+2): 谢谢指点 2011-10-04 10:39:36
一个周期内是由于Berry Phase的周期性决定的,见参考文献R. D. King-Smith and D. Vanderbilt, Phys. Rev. B 47, 1651 (1993).
科研无止境
3楼2011-10-02 20:33:21
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