Quantum interference effects in graphene based side-coupled quantum ring: A non-equilibrium Green’s function approach

Abstract

The present study investigates the I-V and spin-transport characteristics of a side-coupled graphene nano-ring, Where, non-equilibrium Green’s function approach has been employed as computational framework. Meanwhile the effect of substrate induced Rashba interaction has been considered as a source of spin-dependent processes in the transport phenomena. Calculations have been performed within the coherent regime in which the electric and spin currents of the system are given as a function of bias voltage and Rashba coupling strength. Results show that Aharonov–Bohm oscillations and Fano factor could be changed by the Rashba coupling strength. The Rashba interaction can change the Fano factor from the Poisson to sub-Poisson regime in the case of armchair leads.