Free fermion branches in some quantum spin models

Details Free fermion branches in some quantum spin models Free fermion branches in some quantum spin models

2002-05-27

arxiv.org/abs/cond-mat/0205567v1

J.Phys.A35:6767-6788,2002

Physics

Condensed Matter

Statistical Mechanics

30 pages and no figures

Scientific paper

10.1088/0305-4470/35/32/301

Extensive numerical analysis of the eigenspectra of the $SU_q(N)$ invariant Perk-Schultz Hamiltonian shows some simple regularities for a significant part of the eigenspectrum. Inspired by those results we have found two set of solutions of the associated nested Bethe-ansatz equations. The first set is obtained at a special value of the anisotropy ($q = \exp(i2\pi (N-1)/N)$) and describes in particular the ground state and nearby excitations as a sum of free-fermion quasienergies. The second set of solutions provides the energies in the sectors whose number $n_i$ of particles of distinct species ($i =0, >..., N-1$) are less or equal to the unity except for one of the species. For this last set we obtain the eigenspectra of a free fermion model for arbitrary values of the anisotropy.

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