2025-11-18 分子科学研究所
単結晶の金(Au(111))表面における電子のふるまいを表現した模式図
＜関連情報＞
光電子運動量顕微鏡による金(Au(111))表面状態のスピン・軌道偏極方向の決定
Spin and Orbital Polarizations of Au(111) Surface State Determined by Photoelectron Momentum Microscope
Fumihiko Matsui, Kenta Hagiwara, Yusuke Sato, Ryunosuke Sagehashi, and Shigemasa Suga
Journal of the Physical Society of Japan Published: October 31, 2025
DOI:https://doi.org/10.7566/JPSJ.94.114707
Photoelectron momentum microscopy, by combining with synchrotron soft X-ray (SX) and vacuum ultraviolet (VUV) undulators, is employed for the characterization of Fermi surfaces and valence band atomic orbitals from µm-scale regions. The two-dimensional (2D) photoelectron momentum distribution of the Au(111) valence band was measured using this technique. The measurements were performed with p-polarized SX light and s-polarized VUV light. The Shockley surface state near the ¯Γ point was clearly observed as small, spin–orbit split circular contours. Subsequently, the spin polarization orientation of this surface state was determined by utilizing a spin rotator, a 2D spin filter, and a 2D multichannel detector. While the surface states excited by normally incident VUV light showed a very weak intensity, it was distinctly observed that the photoelectron intensity was zero for emission directions perpendicular to the electric field vector. This finding confirms that the surface states are predominantly composed of 6s and 6pz orbitals.
