▎ 摘　　要

In this work, we propose a peculiar T-shaped graphene nanoribbon (TGNR) that shows unusual transport properties. The calculations are based on the tight-binding model and Green's function method, in which transmission of the system is calculated in the coherent and linear response regime. We show two types of asymmetry in the system; geometric contacts in real-space and coupling energy in energy-space. Also, the effects of the TGNR width, and coupling energy on the transport properties are discussed. We compare the transport properties of two-terminal systems with three-terminal systems. Our numerical results show that for the three-terminal system, with decreasing coupling energy, transmission curve of the system oscillates around the Fermi energy. The structure we proposed can be useful for potential application in nanoelectronic devices.