Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3.
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 metastab...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1797088253200826368 |
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| author | Sobota, J Yang, S Analytis, J Chen, Y Fisher, I Kirchmann, P Shen, Z |
| author_facet | Sobota, J Yang, S Analytis, J Chen, Y Fisher, I Kirchmann, P Shen, Z |
| author_sort | Sobota, J |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T02:47:22Z |
| format | Journal article |
| id | oxford-uuid:ac7bc455-d5e4-4a62-ac0f-ba4d65c2c1fc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:47:22Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:ac7bc455-d5e4-4a62-ac0f-ba4d65c2c1fc2022-03-27T03:29:20ZUltrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ac7bc455-d5e4-4a62-ac0f-ba4d65c2c1fcEnglishSymplectic Elements at Oxford2012Sobota, JYang, SAnalytis, JChen, YFisher, IKirchmann, PShen, ZUsing 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. |
| spellingShingle | Sobota, J Yang, S Analytis, J Chen, Y Fisher, I Kirchmann, P Shen, Z Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title | Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title_full | Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title_fullStr | Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title_full_unstemmed | Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title_short | Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3. |
| title_sort | ultrafast optical excitation of a persistent surface state population in the topological insulator bi2se3 |
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