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Title: Spin-dependent terahertz oscillator based on hybrid graphene superlattices

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.
Authors:
; ;  [1] ;  [2]
  1. GISC, Departamento Física de Materiales, Universidad Complutense, E-28040 Madrid (Spain)
  2. Max Planck Institute for the Physics of Complex Systems, 01187 Dresden (Germany)
Publication Date:
OSTI Identifier:
22310849
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMPLITUDES; DIRAC EQUATION; ELECTRIC CURRENTS; GRAPHENE; HYBRID SYSTEMS; NANOSTRUCTURES; OSCILLATIONS; OSCILLATORS; SPIN; SPIN ORIENTATION; SUPERLATTICES; THZ RANGE