Department of PhysicsThe outstanding properties of graphene have enabled to reveal the exotic carrier transport behavior approaching to the relativistic quantum mechanics, act as the excellent diffusion barrier protecting the junction interface from the material intermixing by atomic diffusion, serve as the effective interlayer modulating the electronic states, and offer the promising solid-state platform allowing the quantum optics of the Dirac Fermion. In this dissertaion, the ballistic carrier transport through graphene in two different aspects will be covered. Understanding of vertical transport across graphene-combined hetero-junction and lateral transport in the graphene channel is the main agenda. The sensitive manipulation of electronic states at/across the interface and the controllable distribution of electric potential on the surface can lead to an extraordinary physical phenomenon and conductance switching. Based on that, it is eventually proposed that how the brand-new type graphene-based device can be evolved or what kind of method can be adapted to improve the actual performance of the graphene-based devices significantly regardless of property or quality of graphene.clos
