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Three new variants of the auxiliary-density-matrix method (ADMM) of Guidon, Hutter, and VandeVondele J. Chem. Theory Comput. 6, 2348 (2010) are presented with the common feature that they have a simplified constraint compared with the full orthonormality requirement of the earlier ADMM1 method. All ADMM variants are tested for accuracy and performance in all-electron B3LYP calculations with several commonly used basis sets. The effect of the choice of the exchange functional for the ADMM exchange-correction term is also investigated.
Merlot et al. (Thu,) studied this question.