![]() NCTS (South) | |
DATE | 2011-04-20 |
TIME | 10:30 |
PLACE | Room 815, New Physics Building, NTU |
FIELD | Computational Materials Research |
SPEAKER | Dr. Shigeki Onoda - Condensed Matter Theory Lab., RIKEN, Japan |
TITLE | Chiral spin 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 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.
[1] S. Furukawa, M. Sato, and S. Onoda, Phys. Rev. Lett. 105, 257205 (2010). |