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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¡£ ×î½üÎÒ¿´µ½Ò»ÆªÎÄÏ×£¬ÊÇÓÃsiesta¼ÆËãµÄµç×ӽṹ£¬È»ºó¼ÆËã½éµç³£ÊýÕâÒ»²¿·ÖÊÇÕâÑùÃèÊöµÄ£¬ 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. ÇëÎʸ÷λ´óϺ£¬Õâ¸öÎÄÕÂÀïÃæÓõÄÊÇÉÏÊöÄÄÖÖ·½·¨°¡¡£Íò·Ö¸Ðл¡£ |
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- ×¢²á: 2015-07-10
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