title: Decomposition of the first-order reduced density matrix: an isopycnic localization treatment.
abstract: In this work, we propose a partitioning of the first-order reduced density matrix corresponding to an N-electron system into first-order reduced density matrices associated with regions defined in the real space (regional matrices). The treatment is based on an isopycnic orbital localization transformation that provides regional matrices that are diagonalized by identical localized orbitals, having many attributes associated with chemical concepts (appropriate localization in space, high transferability, etc.). Although the obtained numerical values are similar to those arising from previous studies, their interpretation is more rigorous and the computational cost is much lower.
authors.affiliation: Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428, Buenos Aires, Argentina. qfxaldad@lg.ehu.es
authors.forename: Diego R
authors.initials: DR
authors.lastname: Alcoba
authors.forename: Roberto C
authors.initials: RC
authors.lastname: Bochicchio
authors.forename: Alicia
authors.initials: A
authors.lastname: Torre
authors.forename: Luis
authors.initials: L
authors.lastname: Lain