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xiaoluoj

金虫 (正式写手)

[求助] HSE请教

投了一篇文章,文章中通过DFT计算基得到了一个数据,审稿人提出异议

    Another weak point of the present work is that is relies on the GGA exchange-correlation functional . This functional leads to a well known severe underestimation of the band gap of semiconductors and insulators . This casts serious doubt on the value of the formation energy of negatively charged  defects and of electron affinities. Thus, the   *** obtained in the present work are unfortunately uncertain. The authors may want to argue that since the  *** is the difference between two systems, the band gap problem error is canceled in some way. But they should very carefully discuss this point.
   我想由于是差值,2个体系的误差相减,这个GGA所产生的误差应该可以忽略不计的。我的想法是通过一个例子,运用HSE和GGA两种方法来计算说明,GGA不会影响我的参数的合理性。
   但是,我对于HSE不了解,还请大神指教!
PS:
   由于我的缺陷体系大概有280个原子,我能不能用在采用GGA优化好的结构的基础之上,采用HSE进行自洽计算(我只关心能量)。在INCAR中加入INCAR 中,加入
LHFCALC = .TRUE. ; HFSCREEN = 0.2
ALGO = Damped ; TIME = 0.4
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crante

木虫 (正式写手)

登高

【答案】应助回帖

★ ★ ★ ★
感谢参与,应助指数 +1
xiaoluoj: 金币+3, ★有帮助 2013-06-06 12:21:03
sunyang1988: 金币+1, 谢谢交流 2013-06-06 14:24:29
根本不可能实现,而且服务器内存也肯定不够。
努力才能成功
7楼2013-06-06 10:44:34
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sunyang1988

至尊木虫 (著名写手)

【答案】应助回帖

★ ★ ★ ★
感谢参与,应助指数 +1
xiaoluoj: 金币+3, ★★★很有帮助 2013-06-05 16:45:44
ben_ladeng: 金币+1, 谢谢交流 2013-06-05 21:55:54
目测算不了,HSE计算量超级大,280原子体系。。。
心之所向无惧无悔
2楼2013-06-05 16:44:42
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xiaoluoj

金虫 (正式写手)

引用回帖:
2楼: Originally posted by sunyang1988 at 2013-06-05 16:44:42
目测算不了,HSE计算量超级大,280原子体系。。。

60核,可有可行性???
3楼2013-06-05 16:46:31
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sunyang1988

至尊木虫 (著名写手)

引用回帖:
3楼: Originally posted by xiaoluoj at 2013-06-05 16:46:31
60核,可有可行性???...

试试吧,我也不清楚。我拿很小的体系算过,慢的无法忍受把任务删了
心之所向无惧无悔
4楼2013-06-05 16:47:24
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