Dirac half-metal in a triangular ferrimagnet

Abstract

An idea is proposed for realizing a fully spin-polarized Dirac semimetal in frustrated itinerant magnets. We show that itinerant electrons on a triangular lattice exhibit the Dirac cone dispersion with half-metallic behavior in the presence of a three-sublattice ferrimagnetic order. The Dirac nodes have the same structure as those of graphene. By variational calculation and Monte Carlo simulation, we demonstrate that the ferrimagnetic order with the Dirac node spontaneously emerges in a simple Kondo lattice model with Ising anisotropy. The realization will be beneficial for spintronics as a candidate for spin-current generator.

5 pages, 4 figures, accepted for publication in Phys. Rev. Lett

References in corpus (8)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Topological Insulators
• Spintronics and Pseudospintronics in Graphene and Topological Insulators
• Phase Separation in Electronic Models for Manganites
• A possible ground state and its electronic structure of a mother material (LaOFeAs) of new superconductors
• Partial disorder in an Ising-spin Kondo lattice model on a triangular lattice

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