Itinerant half-metal spin-density-wave state on the hexagonal lattice

Details Itinerant half-metal spin-density-wave state on the hexagonal lattice Itinerant half-metal spin-density-wave state on the hexagonal lattice

2012-02-09

arxiv.org/abs/1202.2127v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We consider electrons on a honeycomb or triangular lattice doped to the saddle point of the bandstructure. We assume system parameters are such that spin density wave (SDW) order emerges below a temperature $T_N$ and investigate the nature of the SDW phase. We argue that at $T < T_N$ the system develops a uniaxial SDW phase whose ordering pattern breaks $O(3) \times Z_4$ symmetry and corresponds to an eight site unit cell with non-uniform spin moments on different sites. This state is a half-metal -- it preserves full original Fermi surface, but has gapless charged excitations in one spin branch only. It allows for electrical control of spin currents and is desirable for nano-science.

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