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- Title
Spin-polarization and magnetoresistance in graphene-based resonant-tunnelling structures.
- Authors
Li, Y.-X.
- Abstract
Spin-dependent transport of relativistic electrons through graphene based double barrier (well) structures with ferromagnetic electrodes have been theoretically investigated. Electron transmission with different spin states is strongly influenced by the incident wave vector, the height (depth) of the barrier and the separation between them. When the angle of the incident electrons is varied from zero to ±π/2, spin polarization varies from zero to 100% with characteristic oscillations that indicate spin anisotropy. Due to Klein tunnelling, spin-polarization is always zero for normal incident electrons; high spin-polarization only occurs at large incident angles. Because the resonance features in the spin-dependent transmission result from resonant electron states in wells or hole states in barriers, the conductance can reach e2/h in this resonant-tunnelling structure.
- Subjects
FERROMAGNETIC materials; ELECTRODES; ELECTRONS; MINING engineering; CATHODE rays; FLUCTUATIONS (Physics)
- Publication
European Physical Journal B: Condensed Matter, 2009, Vol 68, Issue 1, p119
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/e2009-00085-7