title: Hierarchical spin-orbital polarization of a giant Rashba system.
abstract: The Rashba effect is one of the most striking manifestations of spin-orbit coupling in solids and provides a cornerstone for the burgeoning field of semiconductor spintronics. It is typically assumed to manifest as a momentum-dependent splitting of a single initially spin-degenerate band into two branches with opposite spin polarization. Combining polarization-dependent and resonant angle-resolved photoemission measurements with density functional theory calculations, we show that the two "spin-split" branches of the model giant Rashba system BiTeI additionally develop disparate orbital textures, each of which is coupled to a distinct spin configuration. This necessitates a reinterpretation of spin splitting in Rashba-like systems and opens new possibilities for controlling spin polarization through the orbital sector.
authors.affiliation: SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK.
authors.forename: Lewis
authors.initials: L
authors.lastname: Bawden
authors.affiliation: SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK. ; Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Riley
authors.affiliation: School of Applied & Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Choong H
authors.initials: CH
authors.lastname: Kim
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan. ; Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Raman
authors.initials: R
authors.lastname: Sankar
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Monkman
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Shai
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Haofei I
authors.initials: HI
authors.lastname: Wei
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Edward B
authors.initials: EB
authors.lastname: Lochocki
authors.affiliation: Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
authors.forename: Justin W
authors.initials: JW
authors.lastname: Wells
authors.affiliation: School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand. ; NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.
authors.forename: Worawat
authors.initials: W
authors.lastname: Meevasana
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK.
authors.forename: Timur K
authors.initials: TK
authors.lastname: Kim
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK.
authors.forename: Moritz
authors.initials: M
authors.lastname: Hoesch
authors.affiliation: Synchrotron SOLEIL, CNRS-CEA, L'Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Ohtsubo
authors.affiliation: Synchrotron SOLEIL, CNRS-CEA, L'Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Le Fèvre
authors.affiliation: School of Applied & Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Fennie
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA. ; Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, USA.
authors.forename: Kyle M
authors.initials: KM
authors.lastname: Shen
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Fangcheng
authors.initials: F
authors.lastname: Chou
authors.affiliation: SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK.
authors.forename: Phil D C
authors.initials: PD
authors.lastname: King
keywords: Angle-resolved photoemission; BiTeI; Electronic structure; Orbital texture; Rashba; Spin-orbit coupling; spintronics