Time-resolved optical observation of spin-wave dynamics

Details Time-resolved optical observation of spin-wave dynamics Time-resolved optical observation of spin-wave dynamics

1999-11-18

arxiv.org/abs/cond-mat/9911294v1

Phys. Rev. Lett. 83, 4650 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Revtex, with 3 figures embedded in the text

Scientific paper

10.1103/PhysRevLett.83.4650

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.

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