Quantum transport through finite width mesoscopic ring: Enhancement of the current amplitude with the increase of the edge disorder strength in the limit of strong disorder

Abstract

We investigate the effect of edge disorder on quantum transport through a finite width mesoscopic ring attached to two semi-infinite one-dimensional metallic electrodes by the use of Green's function technique. Parametric calculations are given based on the tight-binding formulation to describe the transport properties through such a bridge system. A novel transport phenomenon is observed which gives the enhancement of the current amplitude with the increase of the edge disorder strength in the strong disorder regime, while the amplitude decreases in the weak disorder regime. This feature is completely opposite to that of the bulk disordered ring. In this context we also study the effects of the radius and the width of the ring on such transport and see that the transport properties are significantly influenced by them.