Stability of spontaneous quantum Hall state in the Triangular Kondo-lattice model

Details Stability of spontaneous quantum Hall state in the Triangular Kondo-lattice model Stability of spontaneous quantum Hall state in the Triangular Kondo-lattice model

2010-09-15

arxiv.org/abs/1009.3059v1

Phys. Rev. Lett. 105, 266405 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.105.266405

We study the behavior of the quarter-filled Kondo lattice model on a triangular lattice by combining a zero-temperature variational approach and finite-temperature Monte-Carlo simulations. For intermediate coupling between itinerant electrons and classical moments ${\bf S}_j$, we find a thermodynamic phase transition into an exotic spin ordering with uniform scalar spin chirality and $< {\bf S}_j >=0$. The state exhibits spontaneous quantum Hall effect. We also study how its properties are affected by application of an external magnetic field.

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