Dynamical structure factors of $S=1/2$ two-leg spin ladder systems

Abstract

We investigate dynamical properties of $S=1/2$ two-leg spin ladder systems. In a strong coupling region, an isolated mode appears in the lowest excited states, while in a weak coupling region, an isolated mode is reduced and the lowest excited states become a lower bound of the excitation continuum. We find in the system with equal intrachain and interchain couplings that due to a cyclic four-spin interaction, the distribution of the weights for the dynamical structure factor and characteristics of the lowest excited states are strongly influenced. The dynamical properties of two systems proposed for $\mathrm{SrC}{\mathrm{u}}_2{\mathrm{O}}_3$ are also discussed.

5 pages, 6 figures

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