Electron transport in folded graphene junctions

Using Green's function method, electron transport in graphene folding junctions (GFJs) are studied. All of these junctions are bilayer structures with AA or AB stacking. As for the AA-stacking GFJs, their transport properties are strongly dependent on the edge form and folding angle. The armchair GFJs (AGFJs) with a folding angle of 60^∘ have high reflection to electrons, while those with a folding angle of 120^∘ are nearly reflectionless and transparent. The zigzag GFJs (ZGFJs) show an opposite transport behavior: The junctions with a folding angle of 60^∘ are nearly transparent while those of folding angle 120^∘ have high reflection. As for the AB-stacking GFJs, their transport properties are insensitive to the edge form or folding angle, and all junctions exhibit less reflection to electrons. In addition, interesting edge states different from those in the unfolded nanoribbons are found in the GFJs. Our results indicate that GFJs can be served either as resistors for tuning attenuation of currents or as interconnects for changing directions of current in all graphene-based nanoelectronics.