We have created a nonequilibrium population of antiferromagnetic spin-waves in Cr2O3, and characterized its dynamics, using frequency- and time-resolved nonlinear optical spectroscopy of the exciton-magnon transition. We observe a time-dependent pump-probe line shape, which results from excitation induced renormalization of the spin-wave band structure. We present a model that reproduces the basic characteristics of the data, in which we postulate the optical nonlinearity to be dominated by interactions with long-wavelength spin-waves, and the dynamics to be due to spin-wave thermalization.
@article{arxiv.cond-mat/9911294,
title = {Time-resolved optical observation of spin-wave dynamics},
author = {J. S. Dodge and A. B. Schumacher and D. S. Chemla and N. Ingle and M. R. Beasley},
journal= {arXiv preprint arXiv:cond-mat/9911294},
year = {2009}
}
Comments
4 pages, Revtex, with 3 figures embedded in the text