期刊
JOURNAL OF CHEMICAL PHYSICS
卷 131, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3237029
关键词
-
资金
- NSF [CHE-0807194]
- Welch Foundation [C-0036]
We present a mean-field approach for accurately describing strong correlations via electron number fluctuations and pairings constrained to an active space. Electron number conservation is broken and correct only on average, but both spin and spatial symmetries are preserved. Optimized natural orbitals and occupations are determined by diagonalization of a mean-field Hamiltonian. This constrained-pairing mean-field theory (CPMFT) yields a two-particle density matrix ansatz that exclusively describes strong correlations. We demonstrate CPMFT accuracy with applications to the metal-insulator transition of large hydrogen clusters and molecular dissociation curves. (C) 2009 American Institute of Physics. [doi:10.1063/1.3237029]
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