Spin chirality ordering and anomalous Hall effect in the ferromagnetic Kondo lattice model on the triangular lattice
Abstract
We investigate the ground-state phase diagram for the ferromagnetic Kondo lattice model on a triangular lattice by a variational calculation for various spin orderings up to a four-site unit cell. We find that a noncoplanar four-sublattice ordering with a finite scalar spin chirality emerges at and around 1/4 filling, in addition to the 3/4-filled case, which was predicted to be induced by the perfect nesting of the Fermi surface [I. Martin and C. D. Batista: Phys. Rev. Lett. {\bf 101} (2008) 156402]. The 1/4-filling phase is stable in a wider range of parameters than the 3/4-filling one, and includes a large region of gapped insulating state characterized by a Chern number. We also compute the Hall conductivity in the chiral-ordered phases.
Keywords
Cite
@article{arxiv.1006.4235,
title = {Spin chirality ordering and anomalous Hall effect in the ferromagnetic Kondo lattice model on the triangular lattice},
author = {Yutaka Akagi and Yukitoshi Motome},
journal= {arXiv preprint arXiv:1006.4235},
year = {2010}
}
Comments
4 pages, 4 figures, accepted for publication in J. Phys. Soc. Jpn.; (v2) revised version including minor correction in Fig. 3 and addition of a reference