Publication: Spin-dependent terahertz oscillator based on hybrid graphene superlattices
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2014-09-08
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American Institute of Physics
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We theoretically study the occurrence of Bloch oscillations in biased hybrid graphene systems with spin-dependent superlattices. The spin-dependent potential is realized by a set of ferromagnetic insulator strips deposited on top of a gapped graphene nanoribbon, which induce a proximity exchange splitting of the electronic states in the graphene monolayer. We numerically solve the Dirac equation and study Bloch oscillations in the lowest conduction band of the spin-dependent superlattice. While the Bloch frequency is the same for both spins, we find the Bloch amplitude to be spin dependent. This difference results in a spin-polarized ac electric current in the THz range.
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© 2014 AIP Publishing LLC. We thank E. Diez and Y. M. Meziani for helpful discussions. Work in Madrid was supported by MINECO (Project Nos. MAT2010-17180 and MAT2013-46308).
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