Eur. Phys. J. B (2012) 85: 346
https://doi.org/10.1140/epjb/e2012-30245-5

Regular Article

Spin rotator and shot noise in graphene-based multi-barrier nanostructure

¹ School of materials science and engineering, Nanchang University, Nanchang 330031, P.R. China
² School of Basic Science, East China Jiaotong University, Nanchang 330013, P.R. China
³ School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang 330063, P.R. China

^a e-mail: wuqingping78519@163.com

Received: 20 March 2012
Received in final form: 4 May 2012
Published online: 18 October 2012

Abstract

Based on the transfer-matrix method, the spin transport properties through a graphene-based multi-barrier nanostructure with an exchange field and Rashba spin orbit coupling (SOC), have been investigated. It is found that if Rashba SOC equals to the exchange field, the multi-barrier nanostructure is an efficient way to achieve spin rotators and spin filters. In addition, it is also found that the shot noise of a spin state can be enhanced by electrostatic potential, and plateaus of the Fano factor is formed.