Martin-Luther-Universität Halle-Wittenberg


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Chiral spin order and electromagnetic dynamics in one-dimensional multiferroic cuprates

Dr. Shigeki Onoda

(Condensed Matter Theory Laboratory, RIKEN, Japan)


We show by unbiased numerical calculations that the ferromagnetic nearest-neighbor exchange interaction stabilizes a vector spin chiral order against the quantum fluctuation in a frustrated spin-1/2 chain relevant to multiferroic cuprates, LiCu2O2 and LiCuVO4. Our semi-classical analyses including inter-chain couplings for LiCu2O2 resolve controversies on the helical magnetic    structure and unveil the pseudo-Nambu-Goldstone modes as the origin of experimentally observed electromagnons.

S. Furukawa, M. Sato, and S. Onoda, Phys. Rev. Lett. 105, 257205 (2010).

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