Momentum resolved spin dynamics of bulk and surface excited states in the topological insulator $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$

Abstract

The prospective of optically inducing a spin polarized current for spintronic devices has generated a vast interest in the out-of-equilibrium electronic and spin structure of topological insulators (TIs). In this Letter we prove that only by measuring the spin intensity signal over several order of magnitude in spin, time and angle resolved photoemission spectroscopy (STAR-PES) experiments is it possible to comprehensively describe the optically excited electronic states in TIs materials. The experiments performed on $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$ reveal the existence of a Surface-Resonance-State in the 2nd bulk band gap interpreted on the basis of fully relativistic ab-initio spin resolved photoemission calculations. Remarkably, the spin dependent relaxation of the hot carriers is well reproduced by a spin dynamics model considering two non-interacting electronic systems, derived from the excited surface and bulk states, with different electronic temperatures.

arXiv comment5 pages and 4 figures

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Cited by in corpus (34)

• Colloquium: Topological Band Theory
• Angle-resolved photoemission spectroscopy and its application to topological materials
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• Energy dissipation in the time domain governed by bosons in a correlated material
• Band resolved imaging of photocurrent in a topological insulator
• Unraveling photoinduced spin dynamics in topological insulator Bi2Se3
• Ultrafast spin polarization control of Dirac fermions in topological insulators
• Quantum Anomalous Hall State in Ferromagnetic SrRuO${}_3$ (111) Bilayers
• Surface Fermi arc connectivity in the type-II Weyl semimetal candidate WTe${}_2$
• Sub-picosecond spin dynamics of excited states in the topological insulator Bi${}_2$Te${}_3$
• Weak Localization and Antilocalization in Topological Materials with Impurity Spin-Orbit Interactions
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Spin-, time- and angle-resolved photoemission spectroscopy on WTe${}_2$
• Coherent ultrafast spin-dynamics probed in three dimensional topological insulators
• Electron spin dynamics of two-dimensional layered materials
• Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser
• Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator
• Anomalous Hall Coulomb drag of massive Dirac fermions
• Ultrafast Evolution of Bulk, Surface and Surface Resonance States in Photoexcited Bi${}_2$Te${}_3$
• Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2H-WSe${}_2$
• Ultrafast Momentum-resolved Hot Electron Dynamics in the Two-dimensional Topological Insulator Bismuthene
• Lifetime and surface-to-bulk scattering off vacancies of the topological surface state in the three-dimensional strong topological insulators Bi2Te3 and Bi2Se3
• Selective Trapping of Hexagonally Warped Topological Surface States in a Triangular Quantum Corral
• Numerical scheme for the far-out-of-equilibrium time-dependent Boltzmann collision operator: 1D second-degree momentum discretisation and adaptive time stepping
• Coulomb drag in topological materials
• Topological spin textures in electronic non-Hermitian systems
• Numerical Solver for the out-of-equilibrium time dependent Boltzmann Collision operator: Application to 2D materials
• Control of intervalley scattering in Bi${}_2$Te${}_3$ via temperature-dependent band renormalization
• Nonequilibrium topological spin textures in momentum space
• One step model of photo-emission at finite temperatures: spin fluctuations of Fe(001)
• Spin-orbit effects on the spin and pseudospin polarization in ac-driven silicene
• Surface spectroscopy and surface-bulk hybridization of Weyl semimetals
• Floquet spin textures in optically pumped non-Hermitian surface states