Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3

Abstract

Using femtosecond time- and angle- resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi2Se3. We studied p-type Bi2Se3, in which the metallic Dirac surface state and bulk conduction bands are unoccupied. Optical excitation leads to a meta-stable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10ps. This unusually long-lived population of a metallic Dirac surface state with spin texture may present a channel in which to drive transient spin-polarized currents.

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Cited by in corpus (15)

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• 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 $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• Unoccupied Topological States on Bismuth Chalcogenides
• Effect of carrier recombination on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Magnetization signatures of light-induced quantum Hall edge states
• Electrostatic Coupling between Two Surfaces of a Topological Insulator Nanodevice
• Acoustic phonon dynamics in thin-films of the topological insulator Bi2Se3
• Resonance-type thickness dependence of optical second harmonic generation in thin-films of the topological insulator Bi2Se3
• Classification of Collective Modes in a Charge Density Wave by Momentum-Dependent Modulation of the Electronic Band Structure
• Thickness-Dependent Coherent Phonon Frequency in Ultrathin FeSe/SrTiO${}_3$ Films
• One-step theory of pump-probe photoemission
• Ultrafast electron dynamics at the Dirac node of the topological insulator Sb${}_2$Te${}_3$