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

Rahul Nandkishore, Gia Wei Chern, Andrey V. Chubukov

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We consider electrons on a honeycomb or triangular lattice doped to the saddle point of the band structure. We assume the 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)×Z 4 symmetry and corresponds to an eight-site unit cell with nonuniform spin moments on different sites. This state is a half-metal-it preserves the 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 nanoscience.

Original languageEnglish (US)
Article number227204
JournalPhysical review letters
Issue number22
StatePublished - May 30 2012
Externally publishedYes


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