Gapped Heisenberg spin chains in a field

Details Gapped Heisenberg spin chains in a field Gapped Heisenberg spin chains in a field

2004-06-17

arxiv.org/abs/cond-mat/0406402v1

Phys. Rev. B71, 014437 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 14 figures

Scientific paper

10.1103/PhysRevB.71.014437

We consider the fully anisotropic Heisenberg spin-1/2 antiferromagnet in a uniform magnetic field, whose ground-state is characterized by broken spin rotation symmetry and gapped spinon excitations. We expand on a recent mean-field approach to the problem by incorporating fluctuations in a loop expansion. Quantitative results for the magnetization, excitation gap and specific heat are obtained. We compare our predictions with new DMRG and exact diagonalization data and, for zero field, with the exact solution of the ${XYZ}$ spin chain from the Bethe Ansatz.

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