High-resolution angle-resolved photoemission study of oxygen adsorbed Fe/MgO(001)  

作　　者：Mingtian Zheng Eike FSchwier Hideaki Iwasawa Kenya Shimada 

机构地区：[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

出　　处：《Chinese Physics B》2020年第6期60-68,共9页中国物理B（英文版）

基　　金：Present address Synchrotron Radiation Research Center,National Institutes for Quantum and Radiological Science and Technology,1-1-1 Kouto,Sayo,Hyogo679-5148,Japan

摘　　要：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.

关 键 词：angle-resolved photoemission iron surface oxygen adsorption density-functional theory(DFT) 

分 类 号：O469[理学—凝聚态物理]