Probing emergent excitations with middle-energy electron energy loss spectroscopy
Probing emergent excitations with middle-energy electron energy loss spectroscopy
复制标题
用中能电子能量损失光谱探测紧急激发
DOI：
10.1209/0295-5075/128/57001
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发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
Jak Chakhalian
中科院分区：
文献类型：
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作者：
Yujuan Pei;Xiaoran Liu;Fangdi Wen;M Kareev;Ruyi Zhang;Yang Song;Jiachang Bi;Yanwei Cao;Jak Chakhalian
Probing the emergent excitations in a range of is fundamentally important to understand a variety of emergent phenomena in quantum materials, however, the characterization techniques of which are very limited at present. Here, we take high-temperature superconducting YBa2Cu3O7−δ films ( ) as an archetype to demonstrate the powerful capabilities of middle-energy electron energy loss spectroscopy (EELS) in determining the emergent excitations. Three dominative features (2.9, 12.9, and 25 eV) are observed in the EELS spectra, one of which is a newly observed peak near 2.9 eV resulting from excitations between the Zhang-Rice state and the upper Hubbard band. Moreover, incident energy-dependent EELS spectra indicate that the signals of these three features are strongly dependent on the energy of incident electrons. Our work provides a route to probe emergent excitations in the energy range with utilizing high-resolution two-dimensional energy and momentum mapping.
