Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems

Details Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems

2004-01-14

arxiv.org/abs/cond-mat/0401240v1

Phys. Rev. B 70, 024404 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.024404

We consider the absorption of light with emission of one S(tot)=1 magnetic excitation in systems with a spin gap induced by quantum fluctuations. We argue that an electric dipole transition is allowed on the condition that a virtual phonon instantaneously breaks the inversion symmetry. We derive an effective operator for the transition and argue that the proposed theory explains the polarized experiments in CuGeO(3) and SrCu(2)[BO(3)](2).

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