Resonant two-magnon Raman scattering in two-dimensional and ladder-type Mott insulators

Details Resonant two-magnon Raman scattering in two-dimensional and ladder-type Mott insulators Resonant two-magnon Raman scattering in two-dimensional and ladder-type Mott insulators

2002-11-25

arxiv.org/abs/cond-mat/0211552v1

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX4, 3 pages, 3 figures, Proceedings for ISS2002 (Yokohama, November 2002). To be published in Physica C

Scientific paper

10.1016/S0921-4534(03)01098-0

We investigate the resonant two-magnon Raman scattering in the two-dimensional (2D) and ladder-type Mott insulators by using a half-filled Hubbard model in the strong coupling limit. By performing numerical diagonalization calculations for small clusters, we find that the model can reproduce the experimental features in the 2D that the Raman intensity is enhanced when the incoming photon energy is not near the absorption edge but well above it. In the ladder-type Mott insulators, the Raman intensity is found to resonate with absorption spectrum in contrast to the 2D system. The difference between 2D and the ladder systems is explained by taking into account the fact that the ground state in 2D is a spin-ordered state while that in ladder is a spin-gapped one.

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