期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 34, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac316c
关键词
electronic structure; quantum wells; photoemission spectroscopy; electron affinity
资金
- Deutsche Forschungsgemeinschaft (DFG) [FOR 1878, 214951840]
Epitaxial MgO films on Ag(100) were investigated using photoelectron spectroscopy. Negative electron affinity of about -0.9 eV was obtained from the low-energy region of the spectra. Despite the absence of potential barrier on the surface, quantum-well resonances were observed in the lowest conduction band. The results of this study are in good agreement with theoretical calculations and provide insight into the observation of image-potential states on MgO films.
Epitaxial MgO films on Ag(100) were studied by photoelectron spectroscopy. From the low-energy part of the spectra we obtain a negative electron affinity of about -0.9 eV. Even though electrons in the lowest conduction band are not confined by a potential barrier at the surface, quantum-well resonances are observed. The dispersion of the conduction band is determined in good agreement with theoretical calculations. Aspects of observing image-potential states predicted by theory on MgO films are discussed.
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