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Alkali-metal induced band structure deformation investigated by angle-resolved photoemission spectroscopy and first-principles calculations
- Publication Year :
- 2017
- Publisher :
- arXiv, 2017.
-
Abstract
- Alkali-metal adsorption on the surface of materials is widely used for in situ surface electron doping, particularly for observing unoccupied band structures by angle-resolved photoemission spectroscopy (ARPES). However, the effects of alkali-metal atoms on the resulting band structures have yet to be fully investigated, owing to difficulties in both experiments and calculations. Here, we combine ARPES measurements on cesium-adsorbed ultrathin bismuth films with first-principles calculations of the electronic charge densities and demonstrate a simple method to evaluate alkali-metal induced band deformation. We reveal that deformation of bismuth surface bands is directly correlated with vertical charge-density profiles at each electronic state of bismuth. In contrast, a change in the quantized bulk bands is well described by a conventional rigid-band-shift picture. We discuss these two aspects of the band deformation holistically, considering spatial distributions of the electronic states and cesium-bismuth hybridization, and provide a prescription for applying alkali-metal adsorption to a wide range of materials.<br />Comment: 8 pages, 7 figures
- Subjects :
- Condensed Matter - Materials Science
Materials science
Photoemission spectroscopy
chemistry.chemical_element
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Angle-resolved photoemission spectroscopy
02 engineering and technology
Deformation (meteorology)
021001 nanoscience & nanotechnology
Alkali metal
Elementary charge
01 natural sciences
Molecular physics
Bismuth
Condensed Matter::Materials Science
Adsorption
chemistry
Condensed Matter::Superconductivity
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
010306 general physics
0210 nano-technology
Electronic band structure
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....f31def79f721ee0c4f29491fb84b4eef
- Full Text :
- https://doi.org/10.48550/arxiv.1712.00176