Switching Valley Filtered Current Directions In Multiterminal Graphene Systems

Valley filtering processes have been explored in different graphene-based configurations and scenarios to control transport responses. Here we propose graphene multiterminal setups properly designed to obtain valley filtered currents in a broad range of energy, in addition to the possibility of controlling their directions. We explore graphene systems with extended mechanical foldlike deformations as an opportunity to enhance valley filtered transmission. The mixing between the electronic confinement effects due to a magnetic field and strain results in a selective drive of the current components in the quantum Hall regime. We adopt the mode-matching method within the Green's function formalism, allowing direct analysis of the strain effect on each valley transmission. We estimate a threshold map of confinement parameters, characterized by the magnetic, deformation, and setup lengths, to optimize valley filter transport processes and the proper switch of the valley polarized current directions.