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Datzer, Christian; Zumbülte, Anna; Braun, Jürgen; Förster, Tobias; Schmidt, Anke B.; Mi, Jianli; Iversen, Bo; Hofmann, Philip; Minár, Jan; Ebert, Hubert; Krüger, Peter; Rohlfing, Michael and Donath, Markus (2017): Unraveling the spin structure of unoccupied states in Bi2Se3. In: Physical Review B, Vol. 95, No. 11, 115401

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Abstract

The optical control of spin currents in topological surface states opens new perspectives in (opto-) spintronics. To understand these processes, a profound knowledge about the dispersion and the spin polarization of both the occupied and the unoccupied electronic states is required. We present a joint experimental and theoretical study on the unoccupied electronic states of the topological insulator Bi2Se3. We discuss spin- and angle-resolved inverse-photoemission results in comparison with calculations for both the intrinsic band structure and, within the one-step model of (inverse) photoemission, the expected spectral intensities. This allows us to unravel the intrinsic spin texture of the unoccupied bands at the surface of Bi2Se3.

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