On the ground state energy scaling in quasi-rung-dimerized spin ladders
arXiv:1208.6192 · doi:10.1140/epjb/e2013-30839-3
Abstract
On the basis of periodic boundary conditions we study perturbatively a large N asymptotics (N is the number of rungs) for the ground state energy density and gas parameter of a spin ladder with slightly destroyed rung-dimerization. Exactly rung-dimerized spin ladder is treated as the reference model. Explicit perturbative formulas are obtained for three special classes of spin ladders.
4 pages