Conditions for Describing Triplet States in Reduced Density Matrix Functional Theory.
Conditions for Describing Triplet States in Reduced Density Matrix Functional Theory.
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约简密度矩阵泛函理论中描述三重态的条件
DOI:
10.1021/acs.jctc.6b00257
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发表时间:
2016
影响因子:
5.5
通讯作者:
N. Helbig
中科院分区:
文献类型:
--
作者:
I. Theophilou;N.N. Lathiotakis;N. Helbig
We consider necessary conditions for the one-body reduced density matrix (1RDM) to correspond to a triplet wave function of a two-electron system. The conditions concern the occupation numbers and are different for the high spin projections,Sz= ±1, and theSz= 0 projection. Hence, they can be used to test if an approximate 1RDM functional yields the same energies for both projections. We employ these conditions in reduced density matrix functional theory calculations for the triplet excitations of two-electron systems. In addition, we propose that these conditions can be used in the calculation of triplet states of systems with more than two electrons by restricting the active space. We assess this procedure in calculations for a few atomic and molecular systems. We show that the quality of the optimal 1RDMs improves by applying the conditions in all the cases we studied.
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DOI:
10.1063/1.3624609
发表时间:
2011
期刊:
The Journal of chemical physics
影响因子:
--
作者:
Daniel R. Rohr;K. Pernal
通讯作者:
K. Pernal
影响因子:
5.5
作者:
Yasushi Shinohara;Sangeeta Sharma;S. Shallcross;J. K. Dewhurst;N. Lathiotakis;E. Gross
通讯作者:
E. Gross
影响因子:
2.9
作者:
C. L. Benavides;M. Springborg
通讯作者:
M. Springborg
影响因子:
2.9
作者:
M. A. L. Marques;M. A. L. Marques;N. Lathiotakis
通讯作者:
N. Lathiotakis
影响因子:
2.2
作者:
M. Piris
通讯作者:
M. Piris