title: Disentanglement of surface and bulk Rashba spin splittings in noncentrosymmetric BiTeI.
abstract: BiTeI has a layered and noncentrosymmetric structure where strong spin-orbit interaction leads to a giant Rashba spin splitting in the bulk bands. We present direct measurements of the bulk band structure obtained with soft x-ray angle-resolved photoemission (ARPES), revealing the three-dimensional Fermi surface. The observed spindle torus shape bears the potential for a topological transition in the bulk by hole doping. Moreover, the bulk electronic structure is clearly disentangled from the two-dimensional surface electronic structure by means of high-resolution and spin-resolved ARPES measurements in the ultraviolet regime. All findings are supported by ab initio calculations.
authors.affiliation: Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Landolt
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Eremeev
authors.forename: Yury M
authors.initials: YM
authors.lastname: Koroteev
authors.forename: Bartosz
authors.initials: B
authors.lastname: Slomski
authors.forename: Stefan
authors.initials: S
authors.lastname: Muff
authors.forename: Titus
authors.initials: T
authors.lastname: Neupert
authors.forename: Masaki
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Strocov
authors.forename: Thorsten
authors.initials: T
authors.lastname: Schmitt
authors.forename: Ziya S
authors.initials: ZS
authors.lastname: Aliev
authors.forename: Mahammad B
authors.initials: MB
authors.lastname: Babanly
authors.forename: Imamaddin R
authors.initials: IR
authors.lastname: Amiraslanov
authors.forename: Evgueni V
authors.initials: EV
authors.lastname: Chulkov
authors.forename: Jürg
authors.initials: J
authors.lastname: Osterwalder
authors.forename: J Hugo
authors.initials: JH
authors.lastname: Dil