Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO$_3$

Details Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO$_3$ Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO$_3$

2009-06-17

arxiv.org/abs/0906.3059v2

Phys. Rev. B 80, 094419 (2009) (Editors' suggestion)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.80.094419

We propose a model for the pair of electromagnon excitations observed in the class of multiferroic materials {\it R}MnO$_3$ ({\it R} is a rare-earth ion). The model is based on a harmonic cycloid ground state interacting with a zone-edge magnon and its twin excitation separated in momentum space by two times the cycloid wave vector. The pair of electromagnons is activated by cross coupling between magnetostriction and spin-orbit interactions. Remarkably, the spectral weight of the twin electromagnon is directly related to the presence of a magnetically induced oscillatory polarization in the ground state. This leads to the surprising prediction that TbMnO$_3$ has an oscillatory polarization with amplitude 50 times larger than its uniform polarization.

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