The anisotropic Heisenberg model in a transverse magnetic field

Details The anisotropic Heisenberg model in a transverse magnetic field The anisotropic Heisenberg model in a transverse magnetic field

2002-04-27

arxiv.org/abs/cond-mat/0204590v1

JETP 95, 538 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 3 figures, LaTeX

Scientific paper

10.1134/1.1513828

One dimensional spin-1/2 $XXZ$ model in a transverse magnetic field is studied. It is shown that the field induces the gap in the spectrum of the model with easy-plain anisotropy. Using conformal invariance the field dependence of the gap at small fields is found. The ground state phase diagram is obtained. It contains four phases with different types of the long range order (LRO) and a disordered one. These phases are separated by critical lines, where the gap and the long range order vanish. Using scaling estimations and a mean-field approach as well as numerical calculations in the vicinity of all critical lines we found the critical exponents of the gap and the LRO. It is shown that transition line between the ordered and disordered phases belongs to the universality class of the transverse Ising model.

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