Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator

Abstract

We have performed spin- and angle-resolved photoemission spectroscopy of Bi2Te3 and present the first direct evidence for the existence of the out-of-plane spin component on the surface state of a topological insulator. We found that the magnitude of the out-of-plane spin polarization on a hexagonally deformed Fermi surface (FS) of Bi2Te3 reaches maximally 25% of the in-plane counterpart while such a sizable out-of-plane spin component does not exist in the more circular FS of TlBiSe2, indicating that the hexagonal deformation of the FS is responsible for the deviation from the ideal helical spin texture. The observed out-of-plane polarization is much smaller than that expected from existing theory, suggesting that an additional ingredient is necessary for correctly understanding the surface spin polarization in Bi2Te3.

4 pages, 3 figures

References in corpus (7)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Topological Field Theory of Time-Reversal Invariant Insulators
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• Direct Evidence for the Dirac-Cone Topological Surface States in Ternary Chalcogenide TlBiSe2
• Transmission of topological surface states through surface barriers
• Electronic Structures and Surface States of Topological Insulator Bi${}_{1-x}$Sb${}_x$

Cited by in corpus (42)

• Dirac materials
• Emergent quantum confinement at topological insulator surfaces
• Quantum interference and Aharonov-Bohm oscillations in topological insulators
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• Spin Polarization of Photoelectrons from Topological Insulators
• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators
• Anisotropic effect of warping on the lifetime broadening of topological surface states in angle-resolved photoemission from Bi${}_2$Te${}_3$
• Quasiparticle Interference Studies of Quantum Materials
• Ultrafast Energy- and Momentum-resolved Surface Dirac Photocurrents in the Topological Insulator Sb${}_2$Te${}_3$
• Coherent control over three-dimensional spin polarization for the spin-orbit coupled surface state of Bi${}_2$Se${}_3$
• Spin- and angle-resolved photoemission on topological materials
• Helicity dependent photovoltaic effect in Bi2Se3 under normal incident light
• Surface Shubnikov-de Hass oscillations and non-zero Berry phases of the topological hole conduction in Tl${}_{1-x}$Bi${}_{1+x}$Se${}_2$
• Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperature
• Magnetic order on a topological insulator surface with warping and proximity-induced superconductivity
• Tunneling magnetoresistance devices based on topological insulators: Ferromagnet/insulator/topological-insulator junctions employing Bi${}_2$Se${}_3$
• Designer Meron Lattice on the Surface of a Topological Insulator
• Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
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• Orbital mapping of energy bands and the truncated spin polarization in three-dimensional Rashba semiconductors
• Electrically controllable spin filtering based on superconducting helical states
• Spin Texture and Mirror Chern number in Hg-Based Chalcogenides
• Transforming a Surface State of Topological Insulator by a Bi Capping Layer
• Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in $A$V${}_3$Sb${}_5$ ($A=\text{K, Rb, Cs}$)
• Observation of anisotropic Dirac cones in the topological material Ti2Te2P
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• The electronic structure of Mn${}_{1-x}$Pb${}_x$Bi${}_2$Te${}_4$: experimental evidence of topological phase transition
• Optical study on electronic structure of the locally non-centrosymmetric CeRh${}_2$As${}_2$
• Spinless topological chirality from Umklapp scattering in twisted 3D structures
• Anomalous Linear and Quadratic Nodeless Surface Dirac Cones in Three-Dimensional Dirac Semimetals
• Fluctuated spin-orbital texture of Rashba-split surface states in real and reciprocal space
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Spin-polarized scanning tunneling microscopy measurement scheme for determining the quantum geometric tensor
• Determination of Out-of-plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy
• Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick-Baez mirror optics
• Bulk and surface electron scattering in disordered Bi${}_2$Te${}_3$ probed by quasiparticle interference
• Topological advantage for adsorbate chemisorption on conjugated chains
• Non-uniform Spatial Distribution of Spin Polarization in Topological Insulator (Bi2Te3) Surface
• Relativistic Spin-Lattice Interaction Compatible with Discrete Translation Symmetry in Solids