Super-Poissonian shot noise as a probe of spin bias in mesoscopic systems

Abstract

It is proposed that super-Poissonian shot noise can be used to probe and measure the spinbias in mesoscopic systems. Current shot noise through a quantum dot coupledto two conducting leads is theoretically investigated when a pure spin bias isapplied. It is found that super-Poissonian shot noise may be induced when thedot level is located within the spin bias window. This further demonstrates thedependence of shot noise on the dot–lead coupling asymmetry and the spin-flipscattering.