Scalar spin chirality and quantum Hall effect on a triangular lattice

2008/07/23 by Ivar Martin, C. D. Batista · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.101.156402

published as Phys. Rev. Lett. 101, 156402 (2008) · 4 pages 3 figs

arxiv created 2008/07/23 · arxiv updated 2009/12/01

Abstract

We study the Kondo Lattice and Hubbard models on a triangular lattice for band filling factor 3/4. We show that a simple non-coplanar chiral spin ordering (scalar spin chirality) is naturally realized in both models due to perfect nesting of the Fermi surface. The resulting triple-Q magnetic ordering is a natural counterpart of the collinear Neel ordering of the half-filled square lattice Hubbard model. We show that the obtained chiral phase exhibits a spontaneous quantum Hall-effect with sigma_xy= e²/h.

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