Itinerant Half-Metal Spin-Density-Wave State on the Hexagonal Lattice
Name
Nandkishore-2012-Itinerant Half-Metal Spin-Density-Wave State on the Hexagonal Lattice.pdf
Size
254.11 KB
Format
Adobe PDF
Checksum (MD5)
162de42d1e46d2ce6097f70ceda8541f
Author(s)
Nandkishore, Rahul Mahajan
Chern, Gia-Wei
Chubukov, Andrey V.
Date Issued
May 2012
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.227204
