Journal
PHYSICAL REVIEW B
Volume 93, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.245150
Keywords
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Funding
- Deutsche Forschunsgsgemeinschaft (DFG) [SFB 1170, FOR1162 (P3), SPP 1666, Eb-154/26]
- BMBF [05K13WMA]
- grant of Saint Petersburg State University [15.61.202.2015]
- state assignment of FASO of Russia [01201463326]
- RFBR [14-32-50936]
- [20244045]
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The photoelectron spin polarization in angle-resolved photoemission from the topological surface state in Bi2Te3(0001) has been investigated in a combined experimental and theoretical study. Our measurements show significant photon-energy-dependent deviations in the three-dimensional spin polarization of the photoelectron when compared to the expected intrinsic spin polarization of the surface state. The experimental observations are in line with relativistic one-step photoemission calculations. Our theoretical analysis confirms that spin-orbit coupling in the initial-state wave functions in combination with the dipole selection rules strongly influences the photoelectron spin polarization. Furthermore, spin-dependent final-state effects are found to influence the spin polarization significantly. A quantitative access to the three-dimensional spin-polarization vector in topological insulators is thus challenged by a complex interplay of initial-and final-state effects in the photoemission process.
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