Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation

Abstract

Topological insulators host spin-polarized surface states born out of the energetic inversion of bulk bands driven by the spin-orbit interaction. Here we discover previously unidentified consequences of band-inversion on the surface electronic structure of the topological insulator Bi${}_2$Se${}_3$. By performing simultaneous spin, time, and angle-resolved photoemission spectroscopy, we map the spin-polarized unoccupied electronic structure and identify a surface resonance which is distinct from the topological surface state, yet shares a similar spin- orbital texture with opposite orientation. Its momentum- dependence and spin texture imply an intimate connection with the topological surface state. Calculations show these two distinct states can emerge from trivial Rashba-like states that change topology through the spin-orbit-induced band inversion. This work thus provides a compelling view of the coevolution of surface states through a topological phase transition, enabled by the unique capability of directly measuring the spin-polarized unoccupied band structure.

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
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Ultrafast surface carrier dynamics in the topological insulator Bi2Te3
• Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator
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• Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3
• Spin-transfer torque and spin-polarization in topological-insulator/ferromagnet vertical heterostructures
• Momentum resolved spin dynamics of bulk and surface excited states in the topological insulator $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• Unoccupied Topological States on Bismuth Chalcogenides
• Unconventional transformation of spin Dirac phase across a topological quantum phase transition

Cited by in corpus (13)

• Angle-resolved photoemission spectroscopy and its application to topological materials
• Angle-resolved photoemission spectroscopy
• Chiral Spin Mode on the Surface of a Topological Insulator
• Sub-picosecond spin dynamics of excited states in the topological insulator Bi${}_2$Te${}_3$
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Emergent vortex Majorana zero mode in iron-based superconductors
• A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines
• Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2H-WSe${}_2$
• Majorana bound states in topological insulators with hidden Dirac points
• Spin-polarization of topological crystalline and normal insulator Pb${}_{1-x}$Sn${}_x$Se (111) epilayers probed by photoelectron spectroscopy
• Development of a Laser-based angle-resolved-photoemission spectrometer with sub-micrometer spatial resolution and high-efficiency spin detection
• Nonequilibrium topological spin textures in momentum space
• Surface spectroscopy and surface-bulk hybridization of Weyl semimetals