Evidence of reduced surface electron-phonon scattering in the conduction band of Bi_{2}Se_{3} by non-equilibrium ARPES

Abstract

The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the \emph{surface}. By comparing time-resolved ARPES measurements of the TI Bi_{2}Se_{3} with different probing depths we show that the relaxation dynamics of the electronic temperature of the conduction band is much slower at the surface than in the bulk. This observation suggests that surface phonons are less effective in cooling the electron gas in the conduction band.

arXiv comment5 pages, 3 figures

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• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
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• New Developments in Laser-Based Photoemission Spectroscopy and its Scientific Applications: a Key Issues Review
• Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry
• Gigantic surface life-time of an intrinsic topological insulator revealed via time-resolved (pump-probe) ARPES
• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• Ultrafast Electron Dynamics in the Topological Insulator Bi2Se3 Studied by Time-Resolved Photoemission Spectroscopy
• Time-resolved terahertz dynamics in thin films of the topological insulator Bi${}_2$Se${}_3$
• Momentum resolved spin dynamics of bulk and surface excited states in the topological insulator $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• Singular robust room-temperature spin response from topological Dirac fermions
• Ultrafast Electron Dynamics in Epitaxial Graphene Investigated with Time- and Angle-Resolved Photoemission Spectroscopy
• Surface-to-bulk scattering in topological insulator films
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• A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV
• Fundamentally fastest optical processes at the surface of a topological insulator
• Electronic structure and relaxation dynamics in a superconducting topological material
• Synchrotron radiation induced magnetization in magnetically-doped and pristine topological insulators
• Effect of Mn doping on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Photoinduced changes of the chemical potential in superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Phase diagram and phonon-induced backscattering in topological insulator nanowires
• Nanosecond dynamics in intrinsic topological insulator ${\text{Bi}}_{2-x}{\text{Sb}}_x{\text{Se}}_3$ revealed by time-resolved optical reflectivity
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Cyclotron Resonance in Topological Insulators: Non-Relativistic Effects
• Control of intervalley scattering in Bi${}_2$Te${}_3$ via temperature-dependent band renormalization