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Factorized ground state in dimerized spin chains

Giorgi, Gian Luca
Physica Scripta T140, 014022 (1-4) (2010)

The possibility of observing factorized ground states in dimerized spin systems is studied. A set of sufficient conditions is derived which allows one to establish whether or not it is possible to have factorization both in nearest-neighbour and long-range Hamiltonians. These conditions can be derived by forcing factorization for each of the pairwise terms of the total Hamiltonian. Due to the peculiar structure of a dimerized chain, an antiferromagnetic factorized ground state of the kind [[-not displayable images-]] (forbidden in regular chains) is possible.