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The coefficient of thermal expansion ͑CTE͒ of hydrogenated amorphous carbon (a-C:H) was investigated as a function of the concentration of sp 2 hybridization. The CTE, determined using the thermally induced bending technique, depends on the concentration of sp 2 bonded carbon, increasing to the value of graphite as the sp 2 concentration approaches 100%. By(More)
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. In(More)
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