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Rung-singlet phase of the S=1/2 two-leg spin-ladder with four-spin cyclic exchange | | K.P. Schmidt
; H. Monien
; G.S. Uhrig
; | | Date: |
20 Nov 2002 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | 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. | | Source: | arXiv, cond-mat/0211429 | | Services: | Forum | Review | PDF | Favorites | |
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