Spin-conserving and reversing photoemission from the surface states of Bi${}_2$Se${}_3$ and Au (111)

Abstract

We present a theory based on first-principles calculations explaining (i) why the tunability of spin polarizations of photoelectrons from Bi${}_2$Se${}_3$ (111) depends on the band index and Bloch wavevector 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.

arXiv comment5 pages, 6 figures; Supplemental Material (2 pages) added, typos corrected

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Cited by in corpus (8)

• Rashba spin splitting of L-gap surface states on Ag(111) and Cu(111)
• Coherent control over three-dimensional spin polarization for the spin-orbit coupled surface state of Bi${}_2$Se${}_3$
• Fundamentally fastest optical processes at the surface of a topological insulator
• Effects of spin-orbit coupling on the optical response of a material
• Determination of the time scale of photoemission from the measurement of spin polarization
• Momentum-dependent spin selection rule in photoemission with glide symmetry
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Lippmann-Schwinger Approach for Accurate Photoelectron Wavefunctions and Angle-Resolved Photoemission Spectra from First Principles