Spin chirality ordering and anomalous Hall effect in the ferromagnetic Kondo lattice model on a triangular lattice
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説明
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.
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
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 79 (8), 083711-, 2010-08
Tokyo : Physical Society of Japan
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- CRID
- 1522543654733684224
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- NII論文ID
- 40017245104
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- NII書誌ID
- AA00704814
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- ISSN
- 00319015
- 13474073
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- NDL書誌ID
- 10787455
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- 本文言語コード
- en
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- journal article
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- NDL 雑誌分類
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- ZM35(科学技術--物理学)
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- NDLサーチ
- Crossref
- CiNii Articles
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