二阶Møller-Plesset扰动理论(MP2)是一种后期的后期方法,用于考虑电子相关性效应。尽管形式非常简单,但它可以捕获约90%的相关能量(Bartlett和Stanton,2007年);因此,MP2方法仍然对量子化学感兴趣(Schütz等,1999; Kobayashi和Nakai,2006; Bartlett and Stanton,2007)和固态物理界(Suhai,1983,1983,1992; Sun and Bartlett; Sun and Bartlett,1996; Pisani et; Pisani et。但是,原始(典型)MP2方法的O(n 5)计算缩放限制了MP2方法在大系统中的应用。A series of algorithms have been proposed to speed up the calculations, such as local MP2 method ( Saebø and Pulay, 1993; Pisani et al., 2005, 2008; Maschio, 2011 ), Lapace-transformed MP2 method ( Häser and Almlöf, 1992; Häser, 1993; Ayala and Scuseria, 1999; Ayala et al., 2001;The local MP2 method proposed by Pulay ( 1983 ) and Saebø and Pulay ( 1993 ) has been efficiently implemented ( Schütz et al., 1999 ) in the MOLPRO code for molecules, then the periodic version of the local MP2 method has been implemented ( Pisani et al., 2005, 2008; Maschio, 2011 ) in the CRYSCOR code and in the CP2K code ( Usvyat等人,2018年)用于扩展系统。由于采用了空间局部的轨道或Wannier功能,因此局部MP2方法的计算缩放为O(n)。已经采用了局部原子轨道,计算缩放也为O(n)。最初由Häser和Almlöf(1992)和Häser(1993)提出了Laplace转化的MP2方法,并已针对分子(Ayala and Scuseria,1999)和扩展系统(Ayala等,2001,2001)实施了程序。拉普拉斯转换的MP2方法已与身份(RI)技术的分辨率相结合,以进一步改善
