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

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Using femtosecond time- and angle-resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi{sub 2}Se{sub 3}. We studied p-type Bi{sub 2}Se{sub 3}, 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 >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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Sobota, Jonathan March 14, 2012.

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Using femtosecond time- and angle-resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi{sub 2}Se{sub 3}. We studied p-type Bi{sub 2}Se{sub 3}, 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 >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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  • Journal Name: Submitted to Physical Review Letters; Journal Volume: 108; Journal Issue: 11

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  • Report No.: SLAC-PUB-14885
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevLett.108.117403 | External Link
  • Office of Scientific & Technical Information Report Number: 1036489
  • Archival Resource Key: ark:/67531/metadc833099

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  • March 14, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 4:39 p.m.

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Sobota, Jonathan. Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3, article, March 14, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc833099/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.