Article Spin polarization of photoelectrons emitted from spin-orbit coupled surface states of Pb/Ge(111)

Koichiro Yaji SAMURAI ORCID (National Institute for Materials ScienceROR) ; Kenta Kuroda ; Shunsuke Tsuda SAMURAI ORCID (National Institute for Materials ScienceROR) ; Fumio Komori (National Institute for Materials ScienceROR)

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Koichiro Yaji, Kenta Kuroda, Shunsuke Tsuda, Fumio Komori. Spin polarization of photoelectrons emitted from spin-orbit coupled surface states of Pb/Ge(111). Microscopy. 2024, 73 (5), 439-445. https://doi.org/10.1093/jmicro/dfae021
SAMURAI

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(abstract)

We report that the spin vector of photoelectrons emitted from an atomic layer Pb grown on a germanium substrate [Pb/Ge(111)] can be controlled using an electric field of light. The spin polarization of photoelectrons excited by a linearly polarized light is precisely investigated by spin- and angle-resolved photoemission spectroscopy. The spin polarization of the photoelectrons observed in the mirror plane reverses between p- and s-polarized lights. Considering the dipole transition selection rule, the surface state of Pb/Ge(111) is represented by a linear combination of symmetric and asymmetric orbital components coupled with spins in mutually opposite directions. The spin direction of the photoelectrons is different from that of the initial state when the electric field vector of linearly polarized light deviates from p- or s-polarization conditions. The quantum interference in the photoexcitation process can determine the direction of the spin vector of photoelectrons.

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Keyword: spin polarization, surface state, spin-orbit coupling, quantum interference, spin- and angle-resolved photoemission spectroscopy, Pb/Ge(111)

Date published: 2024-10-04

Publisher: Oxford University Press (OUP)

Journal:

  • Microscopy (ISSN: 00220744) vol. 73 issue. 5 p. 439-445

Funding:

  • Japan Society for the Promotion of Science JP21K04633, JP21H04652, JP22H01761
  • Iketani Science and Technology Foundation
  • Innovative Science and Technology Initiative for Security, ATLA JPJ004596
  • Japan Society for the Promotion of Science JP21K04633, JP21H04652, JP22H01761
  • Iketani Science and Technology Foundation
  • Innovative Science and Technology Initiative for Security, ATLA JPJ004596

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1093/jmicro/dfae021

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Updated at: 2024-10-09 08:30:42 +0900

Published on MDR: 2024-10-09 08:30:42 +0900

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