  Quantum pumping processes are accompanied by considerable quantum noise. We
investigated the pumped shot noise (PSN) properties in adiabatically modulated
graphene-based double-barrier structures. General expressions for adiabatically
PSN in phase-coherent mesoscopic conductors are derived based on the scattering
approach. It is found that comparing with the Poisson processes, the PSN is
dramatically enhanced where the dc pumped current changes flow direction, which
demonstrates the effect of the Klein paradox.
