期刊
JOURNAL OF CHEMICAL PHYSICS
卷 133, 期 4, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3460594
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资金
- National Science Foundation [EPS-0814442]
Using the technique of Perdew and Levy [Phys. Rev. B 31, 6264 (1985)], it is shown that both the density function theory (DFT)-in-DFT and wave function theory (WFT)-in-DFT embedding approaches are formally correct in studying not only the ground state but also a subset of the excited states of the total system. Without further approximations, the DFT-in-DFT embedding approach results in a pair of coupled Euler-Lagrange equations. In contrast to DFT-in-DFT, the WFT-in-DFT approach is shown to ensure a systematic description of excited states if such states are mainly related to excitations within the embedded subsystem. Possible ways for the practical realization of the WFT-in-DFT approach for studying excited states are briefly discussed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3460504]
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