Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3 |
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Authors: | Sobota J A Yang S Analytis J G Chen Y L Fisher I R Kirchmann P S Shen Z-X |
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Institution: | Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA. |
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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 metastable population at the bulk conduction band edge, which feeds a nonequilibrium population of the surface state persisting for >10 ps. 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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