Rung-singlet phase of the S=1/2 two-leg spin-ladder with four-spin cyclic exchange

Details Rung-singlet phase of the S=1/2 two-leg spin-ladder with four-spin cyclic exchange Rung-singlet phase of the S=1/2 two-leg spin-ladder with four-spin cyclic exchange

2002-11-20

arxiv.org/abs/cond-mat/0211429v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures included, submitted to Phys Rev B

Scientific paper

10.1103/PhysRevB.67.184413

Using continuous unitary transformations (CUT) we calculate the one-triplet gap for the antiferromagnetic S=1/2 two-leg spin ladder with additional four-spin exchange interactions in a high order series expansion about the limit of isolated rungs. By applying a novel extrapolation technique we calculate the transition line between the rung-singlet phase and a spontaneously dimerized phase with dimers on the legs. Using this efficient extrapolation technique we are able to analyze the crossover from strong rung coupling to weakly coupled chains.

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