Ultrafast carrier and phonon dynamics in Bi2Se3 crystals

Abstract

Ultrafast time-resolved differential reflectivity of Bi2Se3 crystals is studied using optical pump-probe spectroscopy. Three distinct relaxation processes are found to contribute to the initial transient reflectivity changes. The deduced relaxation timescale and the sign of the reflectivity change suggest that electron-phonon interactions and defect-induced charge trapping are the underlying mechanisms for the three processes. After the crystal is exposed to air, the relative strength of these processes is altered and becomes strongly dependent on the excitation photon energy.

8 pages, 4 figures, accepted for publication in Applied Physics Letters

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• Ultrafast Electron Dynamics in the Topological Insulator Bi2Se3 Studied by Time-Resolved Photoemission Spectroscopy
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• Generation of Transient Photocurrents in the Topological Surface State of Sb${}_2$Te${}_3$ by Direct Optical Excitation with Mid-Infrared Pulses
• Effect of carrier recombination on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators at room temperature
• Phonon spectrum and bonding properties of Bi${}_2$Se${}_3$: Role of strong spin-orbit interaction
• Coherent phonons in a $B{i}_{2}S{e}_3$ film generated by an intense single-cycle THz pulse
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• Ultrafast Energy- and Momentum-resolved Surface Dirac Photocurrents in the Topological Insulator Sb${}_2$Te${}_3$
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• Surface Optical and Bulk Acoustic Phonons in the Topological Insulator, Bi2Se2Te
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• Inverse Edelstein effect of the surface states of a topological insulator
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• Comment on 'Unraveling Photoinduced Spin Dynamics in the Topological Insulator Bi2Se3'
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• Nanosecond dynamics in intrinsic topological insulator ${\text{Bi}}_{2-x}{\text{Sb}}_x{\text{Se}}_3$ revealed by time-resolved optical reflectivity
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• Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air
• Tracking the surface atomic motion in a coherent phonon oscillation
• Research on topological materials using ultrafast spectroscopy