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Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3.

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 surfa...

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Publication status:
Published

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Journal:
Physical Review Letters
Volume:
108
Issue:
11
Pages:
117403
Publication date:
2012-03-01
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Language:
English
Pubs id:
pubs:323516
UUID:
uuid:ac7bc455-d5e4-4a62-ac0f-ba4d65c2c1fc
Local pid:
pubs:323516
Source identifiers:
323516
Deposit date:
2012-12-19

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