Theory of optically forbidden d-d transitions in strongly correlated crystals

Details Theory of optically forbidden d-d transitions in strongly correlated crystals Theory of optically forbidden d-d transitions in strongly correlated crystals

2010-08-31

arxiv.org/abs/1008.5268v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures, to appear in J. Phys. Cond. Matter

Scientific paper

A general multiband formulation of linear and non-linear optical response functions for realistic models of correlated crystals is presented. Dipole forbidden d-d optical transitions originate from the vertex functions, which we consider assuming locality of irreducible four-leg vertex. The unified formulation for second- and third-order response functions in terms of the three-leg vertex is suitable for practical calculations in solids. We illustrate the general approach by consideration of intraatomic spin-flip contributions, with the energy of 2J, where J is a Hund exchange, in the simplest two-orbital model.

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