Thermodynamic extension of density-functional theory. II. Finite-temperature ensemble spin-density functional theory

Details Thermodynamic extension of density-functional theory. II. Finite-temperature ensemble spin-density functional theory Thermodynamic extension of density-functional theory. II. Finite-temperature ensemble spin-density functional theory

2009-04-25

arxiv.org/abs/0904.3990v2

Physics

Chemical Physics

29 pages 1 figure, 3 tables

Scientific paper

The formalism developed in the first paper of the series [arXiv:0901.1060] is applied to two thermodynamic systems: (i) of three global observables (the energy, the total electron number and the spin number), (ii) of one global observable (the internal electron energy) and two local (position-dependent) observables (the total electron density and the spin density). The two-component potential of the many-electron system of interest is constructed of a scalar external potential and a collinear magnetic field (coupled only with the spin operator). Various equilibrium characteristics of two systems are defined and investigated. Conditions for the equivalence between two systems (the same equilibrium density matrix demanded) are derived and thoroughly discussed. The applicability of the Hohenberg-Kohn theorem is extended to the thermodynamic spin-density functional theory. Obtained results provide a rigorous mathematical foundation for future derivation of the zero-temperature limit of this theory and determination of its chemical reactivity indices.

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