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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• THz response and colossal Kerr rotation from the surface states of the topological insulator Bi${}_2$Se${}_3$
• Selective probing of photo-induced charge and spin dynamics in the bulk and surface of a topological insulator
• Spatially resolved femtosecond pump-probe study of topological insulator Bi2Se3
• Ultrafast carrier and phonon dynamics in Bi2Se3 crystals

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