Extrinsic Rashba spin-orbit interaction effect on shot noise properties in silicene superlattice

Abstract

We theoretically study the spin-dependent transmission and shot noise properties in silicene superlattice with extrinsic Rashba spin–orbit interaction (RSOI). It is found that the new Dirac-like point is determined by the ratio of well width to barrier width. The Fano factor shows a peak at new Dirac-like point. Also, Fano factor has an oscillatory behavior for the both spin-up and spin-down electrons with respect to extrinsic RSOI strength and the oscillation period decreases by increasing the number of barriers. The results indicate that the shot noise of a spin state can be efficiently controlled by the on-site potential difference between A and B sublattices (Δz), which can be tuned by the local electric field. The Fano factor increases by increasing the Δz and plateau of the Fano factor is formed. In this case, the transmission can be blocked by the electric barrier and the Fano factor approaches 1.