Alkali-metal induced band structure deformation investigated by angle-resolved photoemission spectroscopy and first-principles calculations

S. Ito, B. Feng, M. Arita, T. Someya, W. C. Chen, A. Takayama, T. Iimori, H. Namatame, M. Taniguchi, C. M. Cheng, S. J. Tang, F. Komori, I. Matsuda

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号155423
ジャーナルPhysical Review B
97
15
DOI
出版ステータスPublished - 2018 4月 20
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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