Chiral order and electromagnetic dynamics in one-dimensional multiferroic cuprates

Abstract

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 realistic semi-classical analyses for LiCu2O2 resolve controversies on the helical magnetic structure and unveil the pseudo-Nambu-Goldstone modes as the origin of experimentally observed electromagnons.

4 pages including 3 figures (main text); 7 pages including 4 figures and 1 table (supplement); accepted for publication in Phys. Rev. Lett

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