Photoelectron spin-polarization-control in the topological insulator Bi2Se3

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.

5 pages, 4 figures. A high-resolution version with supplementary material can be found at: http://www.phas.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/BiSe_spin_ARPES.pdf

References in corpus (2)

• Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator
• Spin Polarization of Photoelectrons from Topological Insulators

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• Fluctuated spin-orbital texture of Rashba-split surface states in real and reciprocal space
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• Controlling helicity-dependent photocurrent in polycrystalline Sb${}_2$Te${}_2$Se topological insulator thin films at ambient temperature through wave-vector of and photothermal gradient due to polarized light