Photoelectron spin-polarization-control in the topological insulator Bi2Se3

• Verfasst von: Zhu, Zheng H. [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Photoelectron spin-polarization-control in the topological insulator Bi2Se3
• Verf.angabe: Z.-H. Zhu, C.N. Veenstra, S. Zhdanovich, M.P. Schneider, T. Okuda, K. Miyamoto, S.-Y. Zhu, H. Namatame, M. Taniguchi, M.W. Haverkort, I.S. Elfimov, and A. Damascelli
• Fussnoten: Die Ziffern 2 und 3 im Titel sind tiefgestellt ; Gesehen am 24.11.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2014
• Band/Heft Quelle: (2014) Artikel-Nummer 1401.1224, 5 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565696069

Abstract

We study the manipulation of the photoelectron spin-polarization in Bi$_2$Se$_3$ by spin- and angle-resolved photoemission spectroscopy. General rules are established that enable controlling the spin-polarization of photoemitted electrons via light polarization, sample orientation, and photon energy. We demonstrate the $\pm$100% reversal of a single component of the measured spin-polarization vector upon the rotation of light polarization, as well as a full three-dimensional manipulation by varying experimental configuration and photon energy. While a material-specific density-functional theory analysis is needed for the quantitative description, a minimal two-atomic-layer model qualitatively accounts for the spin response based on the interplay of optical selection rules, photoelectron interference, and topological surface-state complex structure. It follows that photoelectron spin-polarization control is generically achievable in systems with a layer-dependent, entangled spin-orbital texture.