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Chin. Phys. B, 2020, Vol. 29(6): 067901    DOI: 10.1088/1674-1056/ab9196
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High-resolution angle-resolved photoemission study of oxygen adsorbed Fe/MgO(001)

Mingtian Zheng1, Eike F. Schwier2, Hideaki Iwasawa1, Kenya Shimada2
1 Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;
2 Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan
Abstract  We have investigated the electronic states of clean Fe(001) and oxygen adsorbed Fe(001)-p(1×1)-O films epitaxially grown on MgO(001) substrates by means of polarization-dependent angle-resolved photoemission spectroscopy (ARPES) and extensive density-functional theory (DFT) calculations. The observed Fermi surfaces and band dispersions of pure Fe near the Fermi level were modified upon oxygen adsorption. By the detailed comparison of ARPES and DFT results of the oxygen adsorbed Fe surface, we have clarified the orbital-dependent p-d hybridization in the topmost and second Fe layers. Furthermore, the observed energy levels and Fermi wave numbers for the oxygen adsorbed Fe surface were deviated from the DFT calculations depending on the orbital characters and momentum directions, indicating an anisotropic interplay of the electron correlation and p-d hybridization effects in the surface region.
Keywords:  angle-resolved photoemission      iron surface      oxygen adsorption      density-functional theory (DFT)  
Received:  29 April 2020      Revised:  09 May 2020      Published:  05 June 2020
PACS:  79.60.-i (Photoemission and photoelectron spectra)  
  68.47.Gh (Oxide surfaces)  
  75.70.-i (Magnetic properties of thin films, surfaces, and interfaces)  
Corresponding Authors:  Mingtian Zheng, Kenya Shimada     E-mail:  zhengmingtian@hiroshima-u.ac.jp;kshimada@hiroshima-u.ac.jp

Cite this article: 

Mingtian Zheng, Eike F. Schwier, Hideaki Iwasawa, Kenya Shimada High-resolution angle-resolved photoemission study of oxygen adsorbed Fe/MgO(001) 2020 Chin. Phys. B 29 067901

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