Manipulation of electron beam propagation by hetero-dimensional graphene junctions.

We demonstrate theoretically a new mechanism for the energy-selective manipulation of electron beam by nanostructured heterodimensional graphene junctions (HDGJs). Beam splitting, collimation, and beam-guide can all be realized by designing HDGJs of different dimensionality, size and orientation. Importantly, these different functions can be combined together by predesigned patterning of multiple HDGJ units in one graphene sheet, making it feasible for large-scale integration of quantum devices. Based on transport simulations, we further suggest an method to map out the electron beam propagation path through HDGJs by scanning probe microscopy.