The non-N-representability of the Colle-Salvetti second-order reduced density matrix

1993 ◽  
Vol 46 (4) ◽  
pp. 583-587 ◽  
Author(s):  
Robert C. Morrison
Keyword(s):  
Density Matrix ◽  
Second Order ◽  
Reduced Density Matrix ◽  
Reduced Density

scholarly journals Separation of dynamic and nondynamic correlation

2016 ◽  
Vol 18 (34) ◽  
pp. 24015-24023 ◽  
Author(s):  
Eloy Ramos-Cordoba ◽  
Pedro Salvador ◽  
Eduard Matito
Keyword(s):  
Density Matrix ◽  
Second Order ◽  
Reduced Density Matrix ◽  
Natural Orbital ◽  
Reduced Density

A decomposition of the second-order reduced density matrix provides natural orbital based indices that provide a separation of dynamic and nondynamic correlation.

INFINITE RANGE CORRELATION AND LARGE EIGENVALUES OF THE 2-MATRIX

1967 ◽  
Vol 45 (3) ◽  
pp. 1271-1273 ◽  
Author(s):  
A. J. Coleman
Keyword(s):  
Density Matrix ◽  
Second Order ◽  
Reduced Density Matrix ◽  
Range Correlation ◽  
Reduced Density ◽  
Infinite Range ◽  
Energy Argument

A simple energy argument indicates that the existence of an eigenvalue of order N−1 in the second-order reduced density matrix, or 2-matrix, implies macroscopic correlation characterized by the corresponding eigengeminal.

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