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Photoelectron spin polarization in the Bi2Te3 (0001) topological insulator: Initial- and final-state effects in the photoemission process

Citace:
SEIBEL, C., BRAUN, J., MAASS, H., BENTMANN, H., MINÁR, J., KUZNETSOVA, T. V., KOKH, K. A., TERESHCHENKO, O. E., OKUDA, T., EBERT, H., REINERT, F. Photoelectron spin polarization in the Bi2Te3 (0001) topological insulator: Initial- and final-state effects in the photoemission process. PHYSICAL REVIEW B, 2016, roč. 93, č. 24, s. '245150-1'-'245150-8'. ISSN: 2469-9950
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Photoelectron spin polarization in the Bi2Te3 (0001) topological insulator: Initial- and final-state effects in the photoemission process
Rok vydání: 2016
Autoři: Christoph Seibel , J¨urgen Braun , Henriette Maass , Hendrik Bentmann , Doc.Dr. Jan Minár , Tatyana V. Kuznetsova , Konstantin A. Kokh , Oleg E. Tereshchenko , Taichi Okuda , Hubert Ebert , Friedrich Reinert
Abstrakt EN: The photoelectron spin polarization in angle-resolved photoemission from the topological surface state in Bi2 Te3(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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