Pseudo electric field and pumping valley current in graphene nanobubbles

The extremely high pseudo magnetic field emerging in strained graphene suggests that an oscillating nanodeformation will induce a very high current even without electric bias. In this paper, we demonstrate the subterahertz (THz) dynamics of a valley current and the corresponding charge pumping with a periodically excited nanobubble. We discuss the amplitude of the pseudo electric field and investigate the dependence of the pumped valley current on the different parameters of the system. Finally, we report the signature of extraharmonics generation in the valley current that might lead to potential modern device development operating in the nonlinear regime.