Exact ground state of strongly correlated electron systems from symmetry-entangled wave-functions

Autor: Lepr��vost, A., Juillet, O., Fr��sard, R.

Publikováno v: Annalen der Physik
Annalen der Physik, Wiley, 2014, 526 (9-10), pp.430-436. ⟨10.1002/andp.201400129⟩
Annalen der Physik, 2014, 526 (9-10), pp.430-436. ⟨10.1002/andp.201400129⟩

The four-site Hubbard model is considered from the exact diagonalisation and variational method points of view. It is shown that the exact ground-state can be recovered by a symmetry projected Slater determinant, irrespective of the interaction stren

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