title: Optically-controlled spin valves in conjugated polymers.
abstract: In this article, two optically-controlled spin transfer effects are proposed for pi-conjugated polymers. When such a polymeric molecule undergoes two-photon excitation, the charge of a spin carrier can be reversed, and simultaneously an applied external electric field drives the charge-reversed spin carrier to move in the opposite direction. As for a spinless carrier, the photoexcitation dissociates it into two spin carriers, forming entanglement. The coupling between the newly produced spin carriers and a ferromagnet will change the magnetoresistance. Both the fissions of spinless and spin carriers are ultrafast dynamical processes. By combining an electric field, magnetic field, and photoexcitation, two generic optically-controlled ultrafast response organic spin valves are designed.
authors.affiliation: Department of Physics, Zhejiang Normal University, Zhejiang 310004, China. shenglee@zjnu.cn
authors.forename: Sheng
authors.initials: S
authors.lastname: Li
authors.forename: Thomas F
authors.initials: TF
authors.lastname: George
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: He
authors.forename: Bin-Ping
authors.initials: BP
authors.lastname: Xie
authors.forename: Xin
authors.initials: X
authors.lastname: Sun