Jonathan A. Sobota, Shuolong Yang, James G. Analytis, Yulin Chen, Ian R. Fisher, Patrick S. Kirchmann, Z. -X. Shen
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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http://arxiv.org/abs/1203.3616
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