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xli6

新虫 (初入文坛)

[交流] 【求助】how to calculate system energy?

Guys, when I calculate a 2-D system energy, I just use the following options in siesta fdf file, but after running, the structure has been changed, do you know why? how can I fix it. when I set the lattice vector I make it larger in one direction(y-direction) since I want to leave some vacuum space in that direction in order to avoid the interaction. Thanks!
LatticeConstant  1.0 Ang
%block LatticeVectors
  5.3340      0.0000    0.0000
  0.0000      16.1592    0.0000
  0.0000      0.0000    15.000
%endblock LatticeVectors
%block kgrid_Monkhorst_Pack
    10   0  0     0.0
     0  10  0     0.0
     0   0  1     0.0
MD.TypeOfRun            CG
MD.NumCGsteps           100
MaxSCFIterations        200
MeshCutoff                150 Ry
ElectronicTemperature   300 K
DM.NumberPulay          5
DM.MixingWeight               0.01
SolutionMethod                Diagon
DM.Tolerance            2.d-5  
MD.MaxForceTol                0.02 eV/Ang
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xli6

新虫 (初入文坛)

引用回帖:
Originally posted by xli6 at 2010-02-03 12:52:50:
Guys, when I calculate a 2-D system energy, I just use the following options in siesta fdf file, but after running, the structure has been changed, do you know why? how can I fix it. when I set the ...

I set this option just because I want to relax my model and at the same time get the minimum energy.
4楼2010-02-05 02:14:20
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lfhuang

木虫 (著名写手)

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小木虫(金币+0.5):给个红包,谢谢回帖交流
ice_rain(金币+3):谢谢交流讨论 2010-02-03 20:23
(1)如果只算个能量,结构怎么会变呢?
(2)如果只算个能量,请问您设置参数“MD.MaxForceTol  0.02 eV/Ang”是有什么意图呢?是不是程序有特殊之处?
(3)参数的问题,应该在说明书里挨个仔细对照,楼主说明书读了乎?
先进使役材料计算(https://aidme.nimte.ac.cn)
2楼2010-02-03 18:42:34
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xhsh

木虫 (小有名气)


小木虫(金币+0.5):给个红包,谢谢回帖交流
MD.NumCGsteps           0
3楼2010-02-03 20:48:40
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xli6

新虫 (初入文坛)

引用回帖:
Originally posted by lfhuang at 2010-02-03 18:42:34:
(1)如果只算个能量,结构怎么会变呢?
(2)如果只算个能量,请问您设置参数“MD.MaxForceTol  0.02 eV/Ang”是有什么意图呢?是不是程序有特殊之处?
(3)参数的问题,应该在说明书里挨个仔细对照,楼主说明 ...

I set this option just because I want to relax this model and calculate the minimum energy.
5楼2010-02-05 02:15:20
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