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The Bechgaard salts and their sulfur analogs are considered to be in quasi-one-dimensional correlated electron systems with a quarter-filled π band and exhibit various types of charge and/or spin ordering. A variety of mechanisms have been proposed in an attempt to interpret the variety of instabilities, featuring dimensionality, which can be turned by pressure as well as chemically, intrachain dimerization...
The electronic structure of the one dimensional Hubbard model with a less than half filling is studied by the resonating Hartree-Fock (Res HF) method. For the Hubbard ring with 16 sites, the Res HF wave function composed of only 6 Slater determinants can explain at most 98.6% (14 electrons) and 99.4% (10 electrons) of the exact correlation energy. The spin structure factor in the Res HF ground state...
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