title: Current-induced Orbital and Spin Magnetizations in Crystals with Helical Structure.
abstract: We theoretically show that in a crystal with a helical lattice structure, orbital and spin magnetizations along a helical axis are induced by an electric current along the helical axis. We propose a simple tight-binding model for calculations, and the results can be generalized to any helical crystals. The induced magnetizations are opposite for right-handed and left-handed helices. The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface. This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors.forename: Taiki
authors.initials: T
authors.lastname: Yoda
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors.forename: Takehito
authors.initials: T
authors.lastname: Yokoyama
authors.affiliation: 1] Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan [2] TIES, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Murakami