Itinerant half-metal spin-density-wave state on the hexagonal lattice
Strongly Correlated Electrons
2013-05-15 v1 Mesoscale and Nanoscale Physics
Statistical Mechanics
Abstract
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 and investigate the nature of the SDW phase. We argue that at the system develops a uniaxial SDW phase whose ordering pattern breaks 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.
Cite
@article{arxiv.1202.2127,
title = {Itinerant half-metal spin-density-wave state on the hexagonal lattice},
author = {Rahul Nandkishore and Gia-Wei Chern and Andrey V. Chubukov},
journal= {arXiv preprint arXiv:1202.2127},
year = {2013}
}