Orbital-Selective Spin Texture and its Manipulation in a Topological Insulator

Abstract

Topological insulators represent a new quantum state of matter that are insulating in the bulk but metallic on the edge or surface. In the Dirac surface state, it is well-established that the electron spin is locked with the crystal momentum. Here we report a new phenomenon of the spin texture locking with the orbital texture in a topological insulator Bi2Se3. We observe light-polarization-dependent spin texture of both the upper and lower Dirac cones that constitutes strong evidence of the orbital-dependent spin texture in Bi2Se3. The different spin texture detected in variable polarization geometry is the manifestation of the spin-orbital texture in the initial state combined with the photoemission matrix element effects. Our observations provide a new orbital degree of freedom and a new way of light manipulation in controlling the spin structure of the topological insulators that are important for their future applications in spin-related technologies.

25 pages, 7 figures

References in corpus (12)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• First Principles Studies on 3-Dimentional Strong Topological Insulators: Bi2Te3, Bi2Se3 and Sb2Te3
• Development of a Vacuum Ultra-Violet Laser-Based Angle-Resolved Photoemission System with a Super-High Energy Resolution Better Than 1 meV
• Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator
• Photoelectron spin-flipping and texture manipulation in a topological insulator
• In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3
• Spin-orbital Texture in Topological Insulators
• Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3
• Spin Polarization of Photoelectrons from Topological Insulators
• Realization of an isolated Dirac node and strongly modulated Spin Texture in the topological insulator Bi2Te3
• Coupled Spin-Orbital Texture in a Prototypical Topological Insulator

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• Momentum resolved spin dynamics of bulk and surface excited states in the topological insulator $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• The $8Pmmn$ borophene sheet: A solid-state platform for space-time engineering
• Rashba spin splitting of L-gap surface states on Ag(111) and Cu(111)
• Ultrafast Energy- and Momentum-resolved Surface Dirac Photocurrents in the Topological Insulator Sb${}_2$Te${}_3$
• Direct Mapping of Spin and Orbital Entangled Wavefunction under Interband Spin-Orbit coupling of Rashba Spin-Split Surface States
• 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
• Engineering Topological Surface States and Giant Rashba Spin Splitting in BiTeI/Bi${}_2$Te${}_3$ Heterostructures
• Propagation of Surface Plasmon Polaritons in Thin Films of Topological Insulators
• Spin-resolved electronic response to the phase transition in MoTe${}_2$
• Quantum spin Hall insulators in centrosymmetric thin films composed from topologically trivial BiTeI trilayers
• Orbital pseudospin-momentum locking in two-dimensional chiral borophene
• Fundamentally fastest optical processes at the surface of a topological insulator
• Orbital mapping of energy bands and the truncated spin polarization in three-dimensional Rashba semiconductors
• Role of orbital hybridization in anisotropic magnetoresistance
• Spin-conserving and reversing photoemission from the surface states of Bi${}_2$Se${}_3$ and Au (111)
• Orbit- and Atom-Resolved Spin Textures of Intrinsic, Extrinsic and Hybridized Dirac Cone States
• Coupling-decoupling of conducting topological surface states in thick Bi${}_2$Se${}_3$ single crystals
• Non-contact mutual inductance based measurement of an inhomogeneous topological insulating state in Bi2Se3 single crystals with defects
• Orbital contributions in the element-resolved valence electronic structure of Bi2Se3
• Design of spin-orbital-textures in ferromagnetic/topological insulator interfaces
• Real-space nanoimaging of THz polaritons in the topological insulator Bi2Se3
• Observation of Dirac-like surface state bands on the top surface of BiSe
• Visualization of optical polarization transfer to photoelectron spin vector emitted from the spin-orbit coupled surface state
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Spin texture tunability in Mn${}_{1-x}$Ge${}_x$Bi${}_2$Te${}_4$ through varying Ge Concentration
• Spin-polarized zero-bias peak from a single magnetic impurity at an s-wave superconductor: first-principles study