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Researchers at Federal University Have Reported New Data on Physics Condensed Matter (Optimization of the polarized Klein tunneling currents in a...

July 15, 2014



Researchers at Federal University Have Reported New Data on Physics Condensed Matter (Optimization of the polarized Klein tunneling currents in a sub-lattice: pseudo-spin filters and latticetronics in graphene ribbons)

By a News Reporter-Staff News Editor at Physics Week -- Data detailed on Physics Condensed Matter have been presented. According to news reporting out of Santo Andre, Brazil, by VerticalNews editors, research stated, "We found that with an increase of the potential barrier applied to metallic graphene ribbons, the Klein tunneling current decreases until it is totally destroyed and the pseudo-spin polarization increases until it reaches its maximum value when the current is zero. This inverse relation disfavors the generation of polarized currents in a sub-lattice."

Our news journalists obtained a quote from the research from Federal University, "In this work we discuss the pseudo-spin control (polarization and inversion) of the Klein tunneling currents, as well as the optimization of these polarized currents in a sub-lattice, using potential barriers in metallic graphene ribbons. Using density of states maps, conductance results, and pseudo-spin polarization information (all of them as a function of the energy V and width of the barrier L), we found (V, L) intervals in which the polarized currents in a given sub-lattice are maximized. We also built parallel and series configurations with these barriers in order to further optimize the polarized currents. A systematic study of these maps and barrier configurations shows that the parallel configurations are good candidates for optimization of the polarized tunneling currents through the sub-lattice. Furthermore, we discuss the possibility of using an electrostatic potential as (i) a pseudo-spin filter or (ii) a pseudo-spin inversion manipulator, i.e. a possible latticetronic of electronic currents through metallic graphene ribbons."

According to the news editors, the research concluded: "The results of this work can be extended to graphene nanostructures."

For more information on this research see: Optimization of the polarized Klein tunneling currents in a sub-lattice: pseudo-spin filters and latticetronics in graphene ribbons. Journal of Physics Condensed Matter, 2014;26(6):065301.

Our news journalists report that additional information may be obtained by contacting L.I. Lopez, Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, 09210-170, Santo Andre, SP, Brazil. Additional authors for this research include S.M. Yaro, A. Champi, S. Ujevic and M. Mendoza.

Keywords for this news article include: Brazil, Santo Andre, South America, Physics Condensed Matter.

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Source: Physics Week


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