Spin-dependent quantum interference in photoemission process from spin-orbit coupled states

Koichiro Yaji (), Kenta Kuroda, Sogen Toyohisa, Ayumi Harasawa, Yukiaki Ishida, Shuntaro Watanabe, Chuangtian Chen, Katsuyoshi Kobayashi, Fumio Komori () and Shik Shin
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Koichiro Yaji: Institute for Solid State Physics, The University of Tokyo
Kenta Kuroda: Institute for Solid State Physics, The University of Tokyo
Sogen Toyohisa: Institute for Solid State Physics, The University of Tokyo
Ayumi Harasawa: Institute for Solid State Physics, The University of Tokyo
Yukiaki Ishida: Institute for Solid State Physics, The University of Tokyo
Shuntaro Watanabe: Research Institute for Science and Technology, Tokyo University of Science
Chuangtian Chen: Beijing Center for Crystal Research and Development, Chinese Academy of Science
Katsuyoshi Kobayashi: Ochanomizu University
Fumio Komori: Institute for Solid State Physics, The University of Tokyo
Shik Shin: Institute for Solid State Physics, The University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Spin–orbit interaction entangles the orbitals with the different spins. The spin–orbital-entangled states were discovered in surface states of topological insulators. However, the spin–orbital-entanglement is not specialized in the topological surface states. Here, we show the spin–orbital texture in a surface state of Bi(111) by laser-based spin- and angle-resolved photoelectron spectroscopy (laser-SARPES) and describe three-dimensional spin-rotation effect in photoemission resulting from spin-dependent quantum interference. Our model reveals that, in the spin–orbit-coupled systems, the spins pointing to the mutually opposite directions are independently locked to the orbital symmetries. Furthermore, direct detection of coherent spin phenomena by laser-SARPES enables us to clarify the phase of the dipole transition matrix element responsible for the spin direction in photoexcited states. These results permit the tuning of the spin polarization of optically excited electrons in solids with strong spin–orbit interaction.

Date: 2017
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DOI: 10.1038/ncomms14588

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