We construct integrable spin chains with the inhomogeneous periodic disposition of the anisotropy parameter. The periodicity holds for both auxiliary (space) and quantum (time) directions. The integrability of the model is based on a set of coupled Yang-Baxter equations. This construction yields the P-leg integrable ladder Hamiltonians. We analyse the corresponding quantum group symmetry.
Bibliographical noteFunding Information:
The authors A.S. and T.S. acknowledge the LAPTH, where this work was carried out, for hospitality. T.S. acknowledges also SCOPE grant of SNF, Volkswagen foundation, INTAS grant 00561, and A.S. would to thank INTAS grant 00-390 for partial financial support.