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【求助】請教siesta可否計算磁性體系的介電極化呢?
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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). 這段話,請教siesta可不可以計算考慮自旋的介電極化呢? 做的是磁性材料的介電性能計算,要考慮自旋,pwscf沒法計算自旋體系的電極化,因為磁性體系一般要用smearing和nbnd多于電子數的一半。 因此想問一下siesta可不可以實現這個功能。, 以上英文是從手冊上找到的,但不敢確認,想請教大家一下! 另外,可否發(fā)一下siesta計算多鐵性材料的例子? |
金蟲 (著名寫手)

木蟲 (著名寫手)
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這個是我從一個blog上看到的,不知道對你有沒有用。網址:http://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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