The transport and optoelectronic properties of γ-graphyne-based molecular magnetic tunnel junctions. (June 2018) - Li, Jin
Abstract: By cutting γ -graphyne along different directions, two kinds of γ -graphyne nanodots ( γ -GYNDs) can be acquired. In present study, using the γ -GYNDs we theoretically designed and investigated the spin-dependent transport properties of two kinds of molecular magnetic tunnel junctions (MMTJs). Depending on the orientation of γ -GYND and the connection way between γ -GYND and electrodes, our results show that two kinds of MMTJs have different microscopic transport mechanisms. Significant single or dual spin-filtering effects, giant magnetoresistances (reach 10 8 %) and spin negative differential resistances can be observed in the MMTJs. In addition, the spin-polarized optoelectronic properties of the MMTJs have also been discussed, and the results indicate that the spin-polarized photocurrents are dependent on the polarization direction of light and magnetization directions of the electrodes. Especially, two different light-generated spins can be simultaneously produced in the MMTJs if the incident photons have given energies and they flow along opposite directions. The above findings show that the γ -graphyne-based MMTJs can be used as spintronic devices or opto-spintronic devices. Graphical abstract: Image By designing two kinds of molecular magnetic tunnel junctions based on γ-graphyne and graphene nanoribbons, the transport and optoelectronic properties of spintronic devices can be dramatically enhanced.