Abstract
Abstract We calculate the optical absorption spectrums for the S= 1 2 two-leg spin ladder systems using continued fraction method based on Lanczos algorithm. We use two sets of parameters suggested for an S= 1 2 two-leg spin ladder material SrCu2O3. We find that due to a cyclic four-spin interaction the dispersion curve becomes flatter and hence, the large peak structure appears in the optical absorption spectrums.
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