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http://cms.mpi.univie.ac.at/vasp/vasp/Optical_properties_density_functional_perturbation_theory_PT.html
1¡¢LOPTICS: frequency dependent dielectric matrix £¨ÒѾ­Íê³É£¬¸ÐлfranchÐüÉÍ50½ð±Ò£¬1stÇ¿Ìû1¸ö£©

2¡¢CSHIFT: complex shift in Kramers-Kronig transformation £¨ÒѾ­Íê³É£¬¸Ðлlzl8181£©

3¡¢LNABLA: transversal gauge £¨ÒѾ­Íê³É£¬¸Ðлlzl8181£©

4¡¢LEPSILON: static dielectric matrix, ion-clamped piezoelectric tensor and the Born effective charges using density functional perturbation theory £¨ÒѾ­Íê³É£¬¸Ðлlzl8181 £©

5¡¢LRPA: local field effects on the Hartree level (RPA) £¨ÒѾ­Íê³É£¬¸Ðлfranch£©

6¡¢Vibrational frequencies, relaxed-ion static dielectric tensor and relaxed-ion piezoelectric tensor(ÒѾ­Íê³É£¬¸Ðлlzl8181)

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http://d.namipan.com/d/0897b314d ... d6342c1719ae4a60000


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13Â¥: Originally posted by franch at 2010-11-18 23:04:52
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ÐèÒª·­ÒëµÄÔ­ÎÄÈçÏÂ1¡¢LOPTICS: frequency dependent dielectric matrix

LOPTICS: frequency dependent dielectric matrix
LOPTICS= .TRUE. | .FALSE.

Default: LOPTICS=.FALSE.

If LOPTICS=.TRUE., VASP calculates the frequency dependent dielectric matrix after the electronic ground state has been determined. The imaginary part is determined by a summation over empty states using the equation:


(54)



where the indices  and  refer to conduction and valence band states respectively, and  is the cell periodic part of the orbitals at the k-point . The real part of the dielectric tensor  is obtained by the usual Kramers-Kronig transformation

(55)



where  denotes the principle value. The method is explained in detail in Ref. [84] (Eq. (15), (29) and (30) in Ref. [84]). The complex shift  is determined by the parameter CSHIFT (Sec. 6.65.2).
Note that local field effects, i.e. changes of the cell periodic part of the potential are neglected in this approximation. These can be evaluated using either the implemented density functional perturbation theory (see Sec. 6.65.4) or the GW routines (see Sec. 6.66). Furthermore the method selected using LOPTICS=.TRUE. requires an appreciable number of empty conduction band states. Reasonable results are usually only obtained, if the parameter NBANDS is roughly doubled or tripled in the INCAR file with respect to the VASP default. Furthermore it is emphasized that the routine works properly even for HF and screened exchange type calculations and hybrid functionals. In this case, finite differences are used to determine the derivatives of the Hamiltonian with respect to .

Note that the number of frequency grid points is determined by the parameter NEDOS (see Sec. 6.36). In many cases it is desirable to increase this parameter significantly from its default value. Values around 2000 are strongly recommended.



1¡¢LOPTICS:ƵÂÊÒÀÀµµÄ½éµç¾ØÕó
LOPTICS= .TRUE. | .FALSE.
Default: LOPTICS=.FALSE.
Èç¹ûLOPTICS=.TRUE.£¬Ôڵõ½µç×Ó»ù̬ºóVASP»á¼ÆËãÆµÂÊÒÀÀµµÄ½éµç¾ØÕ󡣯äÐ鲿ÓÉÏÂÃæµÄ·½³Ì¶Ô¿Õ̬»ý·ÖµÃµ½
       
ÆäÖÐϱꠠºÍ ·Ö±ð¶ÔÓ¦ÓÚµ¼´øºÍ½é´øµç×Ó̬£¬  ÊÇÔÚÈ·¶¨K-pointµã ¹ìµÀµÄ¾§°ûÖÜÆÚÐÔ²¿·Ö¡£½éµçÕÅÁ¿µÄʵ²¿ÓÉ¿ËÀ­Ä©-¿ËÀÊÄá¸ñ±ä»»µÃµ½¡£
        (55)
ÆäÖР ´ú±íÖ÷Öµ¡£ Õâ·½·¨µÄÔ­ÀíÔÚÎÄÏ×84(ÎÄÏ×84Öеķ½³Ì(15), (29)ºÍ (30))ÖÐÓоßÌå½âÊÍ¡£¸´ÊýÆ½ÒÆÁ¿  ÓвÎÊýCSHIFT¾ö¶¨¡£(Sec. 6.65.2).
ÐèҪעÒ⣬¾ÖÓò³¡Ð§Ó¦£¬Ò²¾ÍÊÇÊÆÄܵľ§°ûÖÜÆÚÐÔ²¿·ÖÔÚÕâÖÖ½üËÆÖб»ºöÂÔÁË¡£ÕâЩЧӦ¿ÉÒÔͨ¹ýÃܶȷºº¯Î¢ÈÅÀíÂÛ(see Sec. 6.65.4)»òÕßGW(see Sec. 6.66)³ÌÐòËã³ö¡£´ËÍ⣬ѡȡLOPTICS=.TRUEʱ£¬Õâ·½·¨ÐèÒªÏ൱¿É¹ÛÊýÁ¿µÄ¿Õµ¼´øµç×Ó̬¡£ºÏÀíµÄ½á¹ûÖ»ÄÜÊÇÔÚINCARÎļþÖеÄNBANDS Öµ´ó¸ÅÈ¡VASPĬÈÏÖµµÄ2£¬3±¶Ê±µÃµ½¡£ÁíÍ⣬ÕâÀïÐèÒªÖØµãÖ¸³öµÄÊÇ£¬hartree-fock£¬ÆÁ±Î½»»»ÀàÐ͵ļÆËãºÍÔÓ»¯·ºº¯µÄ³ÌÐò¡£ÕâÖÖÇé¿öÏ£¬ÓÃÓÐÏÞ²î·Ö·¨À´¾ö¶¨¹þÃܶÙÁ¿¹ØÓÚ µÄµ¼Êý¡£
ÐèҪעÒâµÄÊÇ£¬ÆµÂÊÍø¸ñµãµÄÊýÁ¿ÓɲÎÊýNEDOS(see Sec. 6.36)¾ö¶¨¡£ÔںܶàÇé¿öÏÂÐèÒªÔö¼ÓÕâ¸ö²ÎÊýÖµ£¬ÏÔÖøµÄ¸ßÓÚËüµÄĬÈÏÖµ¡£2000×óÓÒµÄÊýÖµÊÇÎÒÃÇÇ¿ÁÒÍÆ¼öµÄ¡£



word °æhttp://pic.muchong.com/file.php?id=138

[ Last edited by wuli8 on 2010-11-18 at 23:11 ]
2Â¥2010-11-13 23:47:23
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
ÐèÒª·­ÒëµÄÔ­ÎÄÈçÏÂ2¡¢CSHIFT: complex shift in Kramers-Kronig transformation


CSHIFT= [real]

Default: CSHIFT=0.1

The implemented Kramers-Kronig transformation uses a small complex shift  CSHIFT in Eq. (6.49). The default for this shift is 0.1, which is perfectly acceptable for most calculations and causes a slight smoothening of the real part of the dielectric function. If the gap is very small (i.e. approaching two times CSHIFT), slight inaccuracies in the static dielectric constant are possible, which can be remedied by decreasing CSHIFT. If CSHIFT is further decreased, it is strongly recommended to increase the parameter NEDOS to values around 2000 (see Sec. 6.36).CSHIFT: ¿ËÀ­Ä©-¿ËÀÊÄá¸ñ±ä»»Öеĸ´ÔÓ£¨Êý£¿£©Òƶ¯
CSHIFT= [ʵÊý]     Default: CSHIFT=0.1  È±Ê¡ÉèÖÃÖµ£º0.1
ÔÚ¶ÔEq. (6.49)ʵʩ¿ËÀ­Ä©-¿ËÀÊÄá¸ñ±ä»»Ê±Ê¹ÓÃÁËÒ»¸öСµÄ¸´ÊýÒÆ¶¯  CSHIFT¡£È±Ê¡ÉèÖÃֵΪ0.1£¬Õâ¸öÖµ¶Ô´ó¶àÊý¼ÆËã¿ÉµÃ³ö¿É½ÓÊܵĽá¹û£¬Í¬Ê±¿Éʹ½éµçº¯ÊýµÄʵ²¿±äµÃƽ»¬¡£Èç¹ûÄÜ϶ºÜС£¨Ò²¾ÍÊǽӽüCSHIFTµÄ2±¶£©£¬¿ÉÄܻᵼÖ¼ÆËãËùµÃµÄ¾²Ì¬½éµçº¯ÊýÉÔÏÔ²»×¼È·£¬Õâ¿ÉÒÔͨ¹ý¼õСCSHIFT¶øµÃµ½ÐÞÕý¡£Èç¹ûCSHIFT½øÒ»²½¼õС£¬Ç¿ÁÒÍÆ¼öÔö´ó²ÎÊýNEDOSÖÁ2000×óÓÒ(see Sec. 6.36)
±¾ÎÄÀ´×Ô: Сľ³æÂÛ̳ http://muchong.com/bbs/viewthread.php?tid=2592318&fpage=1&view=&highlight=&page=2

[ Last edited by wuli8 on 2010-12-6 at 23:34 ]
3Â¥2010-11-13 23:47:30
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
ÐèÒª·­ÒëµÄÔ­ÎÄÈçÏÂ3LNABLA: transversal gauge
LNABLA= .TRUE. | .FALSE.

Default: LNABLA=.FALSE.

Usually VASP uses the longitudinal expression for the frequency dependent dielectric matrix as described in the preceeding section (see. 6.65.1). It is however possible to switch to the computationally somewhat simpler transversal expressions by selecting LNABLA=.TRUE. (in this case Eq. (17) and (20) in Ref. [84]). In this simplification the imaginary part of the macroscopic dielectric function  is given by


(56)



Except for the purpose of testing, there is however hardly ever a reason to use the transversal expression, since it is less accurate.[84]

[ Last edited by wuli8 on 2010-11-14 at 00:44 ]
4Â¥2010-11-13 23:48:10
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