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Photoelectron Spin-Polarization Control in the Topological Insulator Bi2Se3

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Haverkort,  M. W.
Maurits Haverkort, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhu, Z.-H., Veenstra, C. N., Zhdanovich, S., Schneider, M. P., Okuda, T., Miyamoto, K., et al. (2014). Photoelectron Spin-Polarization Control in the Topological Insulator Bi2Se3. Physical Review Letters, 112(7): 076802, pp. 1-5. doi:10.1103/PhysRevLett.112.076802.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0017-FE13-D
Abstract
We study the manipulation of the spin polarization of photoemitted electrons in Bi2Se3 by spin- and angle-resolved photoemission spectroscopy. General rules are established that enable controlling the photoelectron spin-polarization. We demonstrate the +/- 100% reversal of a single component of the measured spin-polarization vector upon the rotation of light polarization, as well as 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 yet fully generalized 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.