Spin-conserving and reversing photoemission from the surface states of Bi2Se3 and Au (111)

We present a theory based on first-principles calculations explaining (i) why the tunability of spin polarizations of photoelectrons from Bi sub(2) Se sub(3)(111) depends on the band index and Bloch wave vector of the surface state and (ii) why such tunability is absent in the case of isosymmetric A...

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Bibliographic Details
Published in:Physical review. B 2016-02, Vol.93 (8)
Main Authors: Ryoo, Ji Hoon, Park, Cheol-Hwan
Format: Article
Language:English
Subjects:
Band theory
Bloch waves
Condensed matter
Electron sources
Insulators
Mathematical analysis
Polarization
Reversing
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Summary:We present a theory based on first-principles calculations explaining (i) why the tunability of spin polarizations of photoelectrons from Bi sub(2) Se sub(3)(111) depends on the band index and Bloch wave vector of the surface state and (ii) why such tunability is absent in the case of isosymmetric Au (111). The results provide not only an explanation for the recent, puzzling experimental observations but also a guide toward making highly-tunable spin-polarized electron sources from topological insulators.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.085419