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Spin-dependent terahertz oscillator based on hybrid graphene superlattices

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Díaz García, Elena and Miralles, K. and Domínguez-Adame Acosta, Francisco and Gaul, Christopher (2014) Spin-dependent terahertz oscillator based on hybrid graphene superlattices. Applied physics letters, 105 (10). 103109/1-103109/4. ISSN 0003-6951

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Official URL: http://scitation.aip.org/content/aip/journal/apl/105/10/10.1063/1.4895673


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Abstract

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.


Item Type:Article
Additional Information:

© 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).

Uncontrolled Keywords:Graphene superlattices; Terahertz oscillators
Subjects:Sciences > Physics > Materials
ID Code:29544
Deposited On:14 Apr 2015 12:22
Last Modified:14 Apr 2015 12:22

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