title: Photoelectron spin-polarization control in the topological insulator Bi2Se3.
abstract: We study the manipulation of the spin polarization of photoemitted electrons in Bi2Se3 by spin- and angle-resolved photoemission spectroscopy. General rules are established that enable controlling the photoelectron spin-polarization. We demonstrate the ± 100% reversal of a single component of the measured spin-polarization vector upon the rotation of light polarization, as well as full three-dimensional manipulation by varying experimental configuration and photon energy. While a material-specific density-functional theory analysis is needed for the quantitative description, a minimal yet fully generalized two-atomic-layer model qualitatively accounts for the spin response based on the interplay of optical selection rules, photoelectron interference, and topological surface-state complex structure. It follows that photoelectron spin-polarization control is generically achievable in systems with a layer-dependent, entangled spin-orbital texture.
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Z-H
authors.initials: ZH
authors.lastname: Zhu
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: C N
authors.initials: CN
authors.lastname: Veenstra
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Zhdanovich
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: M P
authors.initials: MP
authors.lastname: Schneider
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Okuda
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Miyamoto
authors.affiliation: Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
authors.forename: S-Y
authors.initials: SY
authors.lastname: Zhu
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Namatame
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan and Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany and Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: M W
authors.initials: MW
authors.lastname: Haverkort
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada and Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: I S
authors.initials: IS
authors.lastname: Elfimov
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada and Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Damascelli