Selective Detection of Angular-Momentum-Polarized Auger Electrons by Atomic Stereography

Fumihiko Matsui, Masayoshi Fujita, Takuya Ohta, Naoyuki Maejima, Hirosuke Matsui, Hiroaki Nishikawa, Tomohiro Matsushita, and Hiroshi Daimon
Phys. Rev. Lett. 114, 015501 – Published 7 January 2015

Abstract

When a core level is excited by circularly polarized light, the angular momentum of light is transferred to the emitted photoelectron, which can be confirmed by the parallax shift of the forward focusing peak (FFP) direction in a stereograph of atomic arrangement. No angular momentum has been believed to be transferred to normal Auger electrons resulting from the decay process filling core hole after photoelectron ejection. We succeeded in detecting a non-negligible circular dichroism contrast in a normal Auger electron diffraction from a nonmagnetic Cu(001) surface far off from the absorption threshold. Moreover, we detected angular-momentum-polarized Cu L3M4,5M4,5 Auger electrons at the L3 absorption threshold, where the excited core electron is trapped at the conduction band. From the kinetic energy dependence of the Auger electron FFP parallax shift, we found that the angular momentum is transferred to the Auger electron most effectively in the case of the S01 two-hole creation.

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  • Received 1 August 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.015501

© 2015 American Physical Society

Authors & Affiliations

Fumihiko Matsui1,*, Masayoshi Fujita1, Takuya Ohta1, Naoyuki Maejima1, Hirosuke Matsui1, Hiroaki Nishikawa1, Tomohiro Matsushita2, and Hiroshi Daimon1

  • 1Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
  • 2Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Sayo, Hyogo 679-5198, Japan

  • *Corresponding author. matui@ms.naist.jp

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Vol. 114, Iss. 1 — 9 January 2015

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