Tracking quintuple layer oxidation on cleaved Bi2Se3 by optical second-harmonic anisotropy

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Authors
An, Yong Q.
Green, Avery J.
Diebold, Alain C.
Issue Date
2016
Type
Article
Language
en_US
Keywords
rotational-anisotropy pattern , intensity lobes , amplitude , surface oxidation , spin polarization , anisotropy
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Alternative Title
Physical Review B
Abstract
We find that the major and minor intensity lobes of a measured rotational-anisotropy pattern of optical second-harmonic generation (SHG) from a cleaved Bi2Se3 (111) surface can gradually change with time and eventually switch their relative amplitudes. This switching provides a means for tracking the progress of surface oxidation inside a quintuple layer of Bi2Se3. At different stages of oxidation, we perform pump-probe SHG experiments to study charge dynamics at the oxide/Bi2Se3 interface and to detect spin polarization of photoexcited surface states in the Bi2Se3 topological insulator.
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Citation
An, Y. Q., Green, A. J., & Diebold, A. C. (2016). Tracking quintuple layer oxidation on cleaved Bi2Se3 by optical second-harmonic anisotropy. Physical Review B, 93, 241308(R). doi:10.1103/PhysRevB.93.241308
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Physical Review B
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ISSN
2469-9950
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