Optical absorption spectra in SrCu_2O_3 two-leg spin ladder

Abstract

We calculate the phonon-assisted optical-absorption spectra in SrCu_2O_3 two-leg spin-ladder systems. The results for two models proposed for SrCu_2O_3 are compared. In the model including the effects of a cyclic four-spin interaction, the shoulder structure appears at 978 cm^{-1} and the peak appears at 1975 cm^{-1} in the spectrum for polarization of the electric field parallel to the legs. In the other model which describes a pure two-leg ladder, the peak appears around the lower edge of the spectrum at 1344 cm^{-1}. The feature can be effective in determining the proper model for SrCu_2O_3.

5 pages, 5 figures, to appear in PRB vol. 67 (2003)

References in corpus (2)

• Phase Diagram of a Spin Ladder with Cyclic Four Spin Exchange
• Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange

Cited by in corpus (3)

• Spectral Properties of Magnetic Excitations in Cuprate Two-Leg Ladder Systems
• Incommensurate state in a quasi-one-dimensional $S=1/2$ bond-alternating antiferromagnet with frustration in magnetic fields
• Antiferromagnetic ordering of energy levels for spin ladder with four-spin cyclic exchange: Generalization of the Lieb-Mattis theorem