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

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

2002-05-28

arxiv.org/abs/cond-mat/0205576v2

Phys. Rev. B 66, 132415 (2002)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 6 figures

Scientific paper

10.1103/PhysRevB.66.132415

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 ${\rm SrCu_2O_3}$ are also discussed.

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