Polarized spin transport in mesoscopic quantum rings with electron phonon and Rashba spin-orbit coupling

The influence of electron-phonon (EP) scattering on spin polarization of current output from a mesoscopic ring with Rashba spin-orbit (SO) interaction is numerically investigated.There are three leads connecting to the ring at different positions;unpolarized current is injected to one of them,and the other two are output channels with different bias voltages.The spin polarization of current in the outgoing leads shows oscillations as a function of EP coupling strength owing to the quantum interference of EP states in the ring region.As temperature increases,the oscillations are evidently suppressed,implying decoherence of the EP states.The simulation shows that the magnitude of polarized current is sensitive to the location of the lead.The polarized current depends on the connecting position of the lead in a complicated way due to the spin-sensitive quantum interference effects caused by different phases accumulated by transmitting electrons with opposite spin states along different paths.