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.
Cite
@article{arxiv.cond-mat/0304319,
title = {Optical absorption spectra in SrCu_2O_3 two-leg spin ladder},
author = {Nobuyasu Haga and Sei-ichiro Suga},
journal= {arXiv preprint arXiv:cond-mat/0304319},
year = {2009}
}
Comments
5 pages, 5 figures, to appear in PRB vol. 67 (2003)