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lxjuan

金虫 (小有名气)

[交流] 【求助】VASP计算得到的极化率输出文件,怎样得到总的极化率

最近在对多铁性磁电材料进行计算,在平衡几何下得到G1,G2和G3如下:
G1
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (   -20.30054,   -20.30054,   -74.14378 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (   -20.30054,   -20.30054,   -74.14378 ) electrons Angst
G2
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,   139.01958 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,   139.01958 ) electrons Angst
G3
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00001 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,   139.01958 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,    -0.00001 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,   139.01958 ) electrons Angst

然后在一个方向上施加一个external strain, 几何驰豫后,比如得到G1,G2,G3
G1
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
G2
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00001 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
G3
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
Expectation value term: ev
= (     0.00000,     0.00000,     0.00000 ) electrons Angst
Berry-Phase term: bp
= (     0.00000,     0.00000,     0.00001 ) electrons Angst
ionic term: ion
= (     0.00000,     0.00000,    84.95641 ) electrons Angst
我的问题是在两种情况下,怎样得到极化率的绝对值?希望大家提供宝贵意见。
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superest

金虫 (小有名气)


zxzj05(金币+1,VIP+0):3Q! 期待更多讨论! 3-31 17:20
个人认为,好像没有极化吧?
2楼2009-03-31 10:06:53
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