title: Spin current due to spinlike Andreev reflection.
abstract: We propose theoretically a spinlike Andreev reflection that may occur at the interface of a semimetal and a doped excitonic insulator. In contrast to the usual Andreev reflection, this process does not produce the charge current, but gives rise to a pure spin current. Further investigation reveals the existence of a spinlike Josephson phenomenon between two excitonic insulators with ferromagnetism, which results in a dissipationless spin current. We stress that the present spin current satisfies the conservation condition and is quite different from the spin Hall current induced from spin-orbital interactions.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Baigeng
authors.initials: B
authors.lastname: Wang
authors.forename: Ju
authors.initials: J
authors.lastname: Peng
authors.forename: D Y
authors.initials: DY
authors.lastname: Xing
authors.forename: Jian
authors.initials: J
authors.lastname: Wang