期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 79, 期 8, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.083711
关键词
spin chirality; anomalous Hall effect; Kondo lattice model; frustration; triangular lattice; Berry phase; Chern number
资金
- Grants-in-Aid for Scientific Research [19052008, 21340090]
- Global COE Program
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [21340090] Funding Source: KAKEN
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. 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.
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