Abstract
An excitonic cluster model is proposed todescribe the optical responses of strongly correlated electronicsystems, e.g. antiferromagnetic insulators of parent crystals ofhigh-temperature superconductors. This model can take intoaccount both the strong correlation effect of 3d-electrons andthe itinerant nature of electronic excitations. Consequentlyboth the electron-hole bound and unbound states can be describedon the same footing. As a result, we can resolve the mystery ofresonance enhancement of 2-magnon Raman scattering, and removeinconsistencies in the understanding of the absorption spectrum,the photoconductivity spectrum, and large-shift Raman signals.
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