Quantum manipulation of valleys in bilayer graphene

Abstract

The valley pseudospin is an inherent electron degree of freedom in graphene. This work establishes a theory for manipulation of valley pseudospins at the quantum level, in bilayer graphene. Two key mechanisms of valley manipulation are proposed and valley-based quantum devices - qubits and field-effect transistors - are implemented based on the mechanisms. This work provides a crucial step in paving the way for the experimental realization (expansion) of valley-based quantum (classical) information processing. © 2013 American Physical Society.