Interlayer magnetoconductance of misoriented bilayer graphene ribbons

The coherent, interlayer conductance of misoriented bilayer graphene ribbons is a strong function of the Fermi energy and magnetic field. Edge states can result in a large peak in the interlayer transmission at the charge neutrality point that is several orders of magnitude larger than the surrounding low-energy transmission. The coherent interlayer conductance is consistently asymmetric around the charge neutrality point for all structures with the value differing by up to 3 orders of magnitude at E-f=+/- 0.05 eV. The low-energy states exhibit a high magnetoconductance ratio, and the magnetoconductance ratio tends to increase as the width of the ribbons decrease. The maximum value for the 35 nm wide bilayer ribbons at 10T is 15000%. Non-equilibrium Green's function calculations of the interlayer transport properties are also supported by semi-analytical calculations based on Fermi's Golden Rule. (c) 2013 AIP Publishing LLC.