Influence of k⊥-broadening on ARPES spectra of the (110) and (001) surfaces of SrVO3 films
Influence of k⊥-broadening on ARPES spectra of the (110) and (001) surfaces of SrVO3 films
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k⊥展宽对SrVO3薄膜(110)和(001)表面ARPES光谱的影响
DOI：
10.1103/physrevb.94.125148
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and H. Kumigashira
中科院分区：
文献类型：
--
作者：
T. Mitsuhashi;M. Minohara;R. Yukawa;M. Kitamura;K. Horiba;M. Kobayashi;and H. Kumigashira
为了研究增宽对角分辨光电子能谱（ARPES）谱的影响，利用同步辐射光的变偏振对薄膜的（110）和（001）面进行了原位ARPES。利用V态能带结构的偏振依赖性，我们分别观察到了导出态和（110）面的态。结果表明，个态的ARPES图象比个态的宽得多。同时，在（001）表面上沿结晶学等效方向沿着的相同导出的能带色散中没有观察到这种加宽，表明ARPES图像的加宽源于相对于ARPES测量平面的各个状态中的镜像对称的存在或不存在。模拟结果很好地再现了所观察到的光谱行为，其中考虑了光电子发射过程中的展宽。这些结果表明，考虑镜像对称的带结构相对于ARPES测量平面是重要的分析的ARPES谱线的形状的情况下，展宽效应是占主导地位的ARPES光谱。
To examine the effect ofbroadening on angle-resolved photoemission spectroscopy (ARPES) spectra,in situARPES using the variable polarization of synchrotron light has been performed for the (110) and (001) surfaces offilms. Using the polarization dependence for the band structures of the Vstates, we have separately observed the-derived states and theones for the (110) surface. It is found that ARPES images for thestates are considerably broader than those for thestates. Meanwhile, such a broadening is not observed in the identical-derived band dispersion along the crystallographically equivalent direction on the (001) surface, indicating that the broadening of the ARPES image originates from the absence or presence of mirror symmetry in the respective states with respect to the ARPES-measurement planes. The observed spectroscopic behavior is well reproduced by the simulation where thebroadening in the photoelectron emission process is taken into account. These results indicate that the consideration of the mirror symmetry of the band structures with respect to the ARPES-measurement plane is important for analyzing the ARPES-spectral line shape in the case that the-broadening effect is dominant in ARPES spectra.