Strong Coupling Expansions for Antiferromagnetic Heisenberg S=1/2 Ladders

M. Reigrotzki, H. Tsunetsugu, T. M. Rice

The properties of antiferromagnetic Heisenberg $S=\frac{1}{2}$ ladders with 2, 3, and 4 chains are expanded in the ratio of the intra- and interchain coupling constants. A simple m…