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http://blog.sina.com.cn/s/blog_6ac7d79301011ydw.html
Õâ¸öÌû×ÓÀïÃæËµÁ˼ÆËãÉù×ÓµÄÈýÖÖ·½·¨£¬·Ö±ðΪLinear Response Theory£¬Frozen Phonon methodºÍ
Finite Displacement method¡£
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  The  imaginary  part  of  the  dielectric  function,  ¦Å2(¦Ø),  has  been  obtained  by  the  simplest  approach
based  on  the  calculation  of  the  dipolar  transition  matrix  elements
between  different  eigen  functions  of  the  self-consistent  Hamiltonian,  carried  out  in  the  momentum  space  formulation.  The  real  part
of  the  dielectric  function,  ¦Å1(¦Ø),  is  extracted  from  ¦Å2(¦Ø)  using  the
Kramers-Kronig  relation.
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