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xirainbow

木虫 (正式写手)

[交流] 【求助】关于赝势的问题

我有三个关于赝势的问题,
希望大家多多帮忙;)

One:

ESPRESSO里有norm-conserving赝势么?我见到的似乎都是超软赝势。


Two:

在PRB的一篇文章中【78, 085421 (2008), paper tile:<>】,作者说到:"The role of spin orbital (SO) coupling is investigated by comparing the results obtained by scalar-relativistic (SR) and fully relativistic (FR) pseudopotentials (PPs), the latter including the SO coupling."
谁能给我解释一下什么是 SR 什么是 FR? 为什么 FR 考虑了OS相互作用?


THREE:

ESPRESSO提供的赝势文件中的说明都代表什么意思?.以"Al.pbe-rrkj.UPF" 为例,其中红色部分究竟给出了什么信息?


Info:   Al PBE 3s2 3p1 RRKJ3
    0        The Pseudo was generated with a Non-Relativistic Calculation
  2.70000000000E+00    Local Potential cutoff radius
nl pn  l   occ               Rcut            Rcut US             E pseu
3S  1  0  2.00      2.70000000000      0.00000000000      0.00000000000
3S  1  0  0.00      2.70000000000      0.00000000000      0.00000000000
3P  2  1  1.00      2.70000000000      0.00000000000      0.00000000000
3P  2  1  0.00      2.70000000000      0.00000000000      0.00000000000
3D  3  2 -1.00      2.70000000000      0.00000000000      0.00000000000





   0                   Version Number
  Al                   Element
   NC                  Norm - Conserving pseudopotential
    F                  Nonlinear Core Correction
SLA  PW   PBE  PBE    PBE  Exchange-Correlation functional
    3.00000000000      Z valence
   -3.86795506860      Total energy
  0.0000000  0.0000000 Suggested cutoff for wfc and rho
    2                  Max angular momentum component
  879                  Number of points in mesh
    2    4             Number of Wavefunctions, Number of Projectors

Wavefunctions         nl  l   occ
                       3S  0  2.00
                       3P  1  1.00



  

  1.90673244359E-04  1.93554901421E-04  1.96480109153E-04  1.99449525739E-04

  9.70329530076E+01  9.84994182962E+01  9.99880463695E+01
  
  

  2.86009866538E-06  2.90332352132E-06  2.94720163730E-06  2.99174288608E-06
  3.03695728963E-06  3.08285502138E-06  3.12944640852E-06  3.17674193431E-06

  1.45549429511E+00  1.47749127444E+00  1.49982069554E+00
  



-7.25980465133E+00 -7.25980475993E+00 -7.25980487183E+00 -7.25980498717E+00
-7.25980510600E+00 -7.25980522831E+00 -7.25980535433E+00 -7.25980548434E+00

-6.18346647612E-02 -6.09140665376E-02 -6.00071742360E-02




  
    1    0             Beta    L
   649

-3.52964096267E-02 -3.58298465848E-02 -3.63713454119E-02 -3.69210279476E-02

2.15561256980E-07 -2.44715628139E-08  1.82668693194E-09  5.37006458764E-09
-5.82287887982E-08
  
  
    2    0             Beta    L
   649

  2.56097001782E-02  2.59967412596E-02  2.63896317191E-02  2.67884599589E-02

-1.52137552763E-07  1.72749965377E-08 -1.29121979946E-09 -3.78336587234E-09
  4.10286122746E-08
  
  
    3    1             Beta    L
   649

-2.75805435350E-05 -2.84204959187E-05 -2.92860286473E-05 -3.01779207577E-05

1.25997108233E-05 -1.43804615669E-06  2.09895499580E-07  1.78464679547E-07
-3.42452429007E-07
  
  
    4    1             Beta    L
   649

-2.76724844115E-05 -2.85152368085E-05 -2.93836548235E-05 -3.02785200899E-05

1.27750634420E-05 -1.45805143237E-06  2.12814049583E-07  1.80955365674E-07
-3.47231003224E-07
  
  
    6                  Number of nonzero Dij
    1    1  4.07088075075E-01
    1    2  5.77117882330E-01
    2    2  8.19052538612E-01
    3    3  1.34228751721E-01
    3    4 -1.32383603869E-01
    4    4  1.30561909720E-01
  





3S    0  2.00          Wavefunction

  2.79534812805E-05  2.83759441026E-05  2.88047916351E-05  2.92401203706E-05

  3.40489027555E-29  1.22100789559E-29  4.31073163857E-30  1.49795301962E-30
  5.12219452854E-31  1.72313386617E-31  5.70137822299E-32
3P    1  1.00          Wavefunction
  6.87661603406E-09  7.08604017114E-09  7.30184222275E-09  7.52421642531E-09

  1.05611541694E-18  5.55019912564E-19  2.88824779690E-19




  1.56279427869E-09  1.61038845764E-09  1.65943209560E-09  1.70996933519E-09

  1.11537977390E-36  3.08047103343E-37  8.34197533627E-38


[ Last edited by xirainbow on 2009-7-20 at 14:39 ]
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lfhuang

木虫 (著名写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
引用回帖:
Originally posted by xirainbow at 2009-8-18 20:24:
只是我本人并不做这方面
只是想对他做一个类似科普性质的了解
所以,我估计自己是不会去查看原始文献的;P

?????
先进使役材料计算(https://aidme.nimte.ac.cn)
7楼2009-08-19 09:28:44
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xirainbow

木虫 (正式写手)

★ ★ ★
zxzj05(金币+3,VIP+0):3Q!~ ^_^ 鼓励讨论! 7-28 17:01
自问自答吧;)
关于第一个问题:ESPRESSO赝势后缀USP不是ultra-soft-pseudo-file的缩写,而是Unified Pseudopotential File 的缩写。所以,究竟是超软还是模守恒,要看赝势文件的内容而定。

关于第二个问题:在/espresso-4.0.4/atomic_doc/pseudo_library>文件夹下的README里写到
LDA/REL contains fully relativistic LDA pseudopotentials.
LDA/SR  contains scalar relativistic LDA pseudopotentials.
PBE/REL contains fully relativistic PBE-GGA pseudopotentials.
PBE/SR  contains scalar relativistic PBE-GGA pseudopotentials.
看来,ESPRESSO是能够提供SR和FR赝势的。至于SR和FR意义,依然迷茫.....

This is the distribution of the ld1 code for electronic structure atomic calculations and pseudo-potentials generation.
The ld1 code, maintained by Andrea Dal Corso (SISSA, Trieste) is the result of several additions to the original code by P. Giannozzi http://www.fisica.uniud.it/~giannozz/software.html) for pseudopotential generation. The major additions are:
a) Generation and test of norm-conserving and ultrasoft pseudo-potentials with the Rappe-Rabe-Kaxiras-Joannopoulos (RRKJ) recipe   ( Phys. Rev. B41, 1227 (1990); Phys. Rev. B 44, 13175 (1991) )
b) Generation of fully relativistic pseudo-potentials including  spin-orbit coupling.
c) Generation of PAW dataset. Based on the original implementation  by G. Fratesi with several additions by R. Mazzarello.

Input variables are described in file INPUT_LD1. Directories all-electron/, pseudo-gen/, pseudo-test/, contain tests for the three modes of operation, respectively: all-electron run, pseudo-potential generation, pseudo-potential testing. Directory pseudo_library/ contains input data used for pseudopotential generation of many elements.

[ Last edited by xirainbow on 2009-7-28 at 18:23 ]
2楼2009-07-27 12:57:41
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chenzhao6239

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
引用回帖:
Originally posted by xirainbow at 2009-7-27 12:57:
自问自答吧;)
关于第一个问题:ESPRESSO赝势后缀USP不是ultra-soft-pseudo-file的缩写,而是Unified Pseudopotential File 的缩写。所以,究竟是超软还是模守恒,要看赝势文件的内容而定。

关于第二个问题: ...

这个问题提有意义的。
3楼2009-08-16 11:48:11
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chenzhao6239

木虫 (正式写手)

麻烦哪位高手指导一下吧,不胜感激.
4楼2009-08-16 11:50:06
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