Order Parameters in XXZ-Type Spin 1/2 Quantum Models with Gibbsian Ground States

Details Order Parameters in XXZ-Type Spin 1/2 Quantum Models with Gibbsian Ground States Order Parameters in XXZ-Type Spin 1/2 Quantum Models with Gibbsian Ground States

2006-01-27

arxiv.org/abs/math-ph/0601060v1

SIGMA 2 (2006), 011, 6 pages

Physics

Mathematical Physics

Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/

Scientific paper

10.3842/SIGMA.2006.011

A class of general spin 1/2 lattice models on hyper-cubic lattice $Z^d$, whose Hamiltonians are sums of two functions depending on the Pauli matrices $S^1$, $S^2$ and $S^3$, respectively, are found, which have Gibbsian eigen (ground) states and two order parameters for two spin components $x$, $z$ simultaneously for large values of the parameter $\alpha$ playing the role of the inverse temperature. It is shown that the ferromagnetic order in $x$ direction exists for all dimensions $d\geq 1$ for a wide class of considered models (a proof is remarkably simple).

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