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

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    Tracking quintuple layer oxidation on cleaved Bi2Se3 by optical second-harmonic anisotropy_Final.pdf (1.355Mb)
    Date
    2016
    Author
    An, Yong Q.
    Green, Avery J.
    Diebold, Alain C.
    Publisher
    Physical Review B
    Metadata
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    Subject
    rotational-anisotropy pattern
    intensity lobes
    amplitude
    surface oxidation
    spin polarization
    anisotropy
    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.
    URI
    http://hdl.handle.net/1951/69161
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    • SUNY Polytechnic Institute Faculty and Staff Research, Publications, and Creative Works [63]

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