Ground-state factorization and quantum phase transition in dimerized spin chains

Details Ground-state factorization and quantum phase transition in dimerized spin chains Ground-state factorization and quantum phase transition in dimerized spin chains

2009-02-13

arxiv.org/abs/0902.2266v1

Physical Review B 79, 060405(R) (2009)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevB.79.060405

We study the occurrence of ground-state factorization in dimerized $XY$ spin chains in a transverse field. Together with the usual ferromagnetic and antiferromagnetic regimes, a third case emerges, with no analogous in translationally-invariant systems, consisting of an antiferromagnetic Ne\'{e}l-type ground state where pairs of spins represent the unitary cell. Then, we calculate the exact solution of the model and show that the factorizing field represent an accidental degeneracy point of the Hamiltonian. Finally, we extend the study of the existence of ground-state factorization to a more general class of models.

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