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identation

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It has to be stressed that the macroscopic polarization can only be meaningfully calculated
using this approach for insulators. Therefore, the presence of an energy gap is necessary,
and no band can cross the Fermi level. The program performs a simple check of this
condition, just by counting the electrons in the unit cell ( the number must be even for
a non-magnetic system, and the total spin polarization must have an integer value for
spin polarized systems), however is the responsability of the user to check that the system
under study is actually an insulator (for both spin components if spin polarized).

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linghuntuzi

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identation(½ð±Ò+2):лл²ÎÓë
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zhangguangping

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¡ï ¡ï ¡ï ¡ï ¡ï
identation(½ð±Ò+2):лл²ÎÓë
aylayl08(½ð±Ò+2):¸ÐлÌṩÐÅÏ¢ 2010-10-21 14:58:30
zzy870720z(½ð±Ò+2):Ð»Ð»×ªÔØ 2010-10-23 14:24:09
ÒýÓûØÌû:
Originally posted by identation at 2010-09-25 16:53:42:
It has to be stressed that the macroscopic polarization can only be meaningfully calculated
using this approach for insulators. Therefore, the presence of an energy gap is necessary,
and no band  ...

Õâ¸öÊÇÎÒ´ÓÒ»¸öblogÉÏ¿´µ½µÄ£¬²»ÖªµÀ¶ÔÄãÓÐûÓÐÓá£ÍøÖ·£ºhttp://blog.chinaunix.net/u2/85704/showart_2022856.html
========================================
Regarding real part of dielectric function



Regarding real part of dielectric function
Systemlabel.EPSIMG  generated by SIESTA, contains the imaginary part of the dielectric function in the energy range specified in the input file of SIESTA. the program The programs contained in the directory (siesta-2.0/Util/Optical) calculate different optical properties of a solid out of the file.

There are two small programs:

input.f

and

optical.f


Both can be compile independently:

     f77( f95, f90,....) input.f -o inpu
     
     f77( f95, f90,....)  optical.f -o optical


* The first program creates the input file for optical (e2.dat), containing the
imaginary part of the dielectric function, from the file Systemlabel.EPSIMG

* The second reads a file called 'e2.dat' containing
the imaginary part of the dieletric function, and creates the
files :
'epsilon_real.out'  containing the real part of the dielectric function
'epsilon_img.out'  containing the imaginary part of the dielectric function
'refrac_index.out'   containing the refraction index
'absorp_index.out'  containing the extintion coefficient
'absorp_coef.out'    containing the absorption coefficient in cm**-1
'reflectance.out'     containing the reflectance
'conductivity.out'     containing the optical conductivity in (ohm*m)**-1

To do so, you just need to type:

    ./ input < Systemlabel.EPSIMG
  
    ./optical
Karim
=========================================
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