Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
Journal Article
·
· Submitted to Physical Review Letters
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1036489
- Report Number(s):
- SLAC-PUB-14885; PRLTAO; TRN: US201206%%335
- Journal Information:
- Submitted to Physical Review Letters, Vol. 108, Issue 11; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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