Electromagnon Resonances in the Optical Response of Spiral Magnets

Details Electromagnon Resonances in the Optical Response of Spiral Magnets Electromagnon Resonances in the Optical Response of Spiral Magnets

2009-02-03

arxiv.org/abs/0902.0495v2

Phys. Rev. B 80, 180416(R) (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

The optical response of spiral magnets is studied, with special attention to its electromagnon features. We show that these features trace back to the resonant magnetoelectric response resulting from the spiral ordering (irrespective of any concomitant ferroelectricity). This response, being magnetoelectric in nature, not always can be reduced to an effective electric permittivity. We argue that electromagnons in spiral magnets can produce, in addition to the observed peaks in the optical absorption of multiferroics, a (dynamically enhanced) optical rotation and a negative refractive index behavior.

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