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|Date and time:||13th Dec. (Tue.) 16:00〜|
|Place:||SPring-8, "HOUKOUKAN" seminar room|
|Title:||Multiple-Q states and skyrmion lattice of the triangular-lattice Heisenberg antiferromagnet under magnetic fields|
|講演者:||大久保 毅 氏（大阪大学・理学研究科・宇宙地球）|
|Speaker:||Dr. Tsuyoshi Okubo (Osaka University)|
We study the ordering of the classical antiferromagnetic Heisenberg model on the triangular lattice with the next-nearest-neighbor (or the third-neighbor) interaction under magnetic fields by means of a mean-field analysis and a Monte Carlo simulation. When further-neighbor interactions become dominant, the ground state in zero magnetic field takes an incommensurate helical spin structure, which has three-fold degeneracy associated with three equivalent directions of the wavevector on the triangular lattice. We show that not only a simple single-Q state but also a variety of multiple-Q states, including the so-called "skyrmion-lattice" state, are stabilized under applied magnetic fields.