Abstract:Working in a subspace with dimensionality much smaller than the dimension of the full Hilbert space, we deduce exact 4-particle ground states in 2D samples containing hexagonal repeat units and described by Hubbard type of models. The procedure identifies first a small subspace S in which the ground state |Ψ g is placed, than deduces |Ψ g by exact diagonalization in S. The small subspace is obtained by the repeated application of the HamiltonianĤ on a carefully chosen starting wave vector describing the most i… Show more
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