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Itinerant Half-Metal Spin-Density-Wave State on the Hexagonal Lattice

Author(s)
Nandkishore, Rahul Mahajan; Chern, Gia-Wei; Chubukov, Andrey V.
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Abstract
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[subscript N] and investigate the nature of the SDW phase. We argue that at T≤T[subscript N], the system develops a uniaxial SDW phase whose ordering pattern breaks O(3)×Z[subscript 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.
Date issued
2012-05
URI
http://hdl.handle.net/1721.1/72484
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Nandkishore, Rahul, Gia-Wei Chern, and Andrey Chubukov. “Itinerant Half-Metal Spin-Density-Wave State on the Hexagonal Lattice.” Physical Review Letters 108.22 (2012): 227204. © 2012 American Physical Society.
Version: Final published version
ISSN
0031-9007
1079-7114

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