Electrostatic potential screened by a two-dimensional electron system: A real-space observation by scanning-tunneling spectroscopy

Masanori Ono, Y. Nishigata, T. Nishio, T. Eguchi, Y. Hasegawa

研究成果: Article査読

50 被引用数 (Scopus)

抄録

Scanning-tunneling spectroscopy at 5â K was used to investigate the electrostatic potential profile on the Si(111)-3ã- 3â€s†Ag surface at subnanometer spatial resolution. The potential was measured from an energy-level shift of electronic states on the surface. The potential images obtained reveal that the potential drops around the steps and Ag adsorbates, upon which positive charges are presumably accumulated. The profiles of the reduced potentials are explained with the screening of potential due to the charges by two-dimensional electron gas (2DEG) existing on the surface. The Friedel oscillation, which results from the screening and has a period of the half Fermi wavelength of the 2DEG, was also observed in the potential images.

本文言語English
論文番号016801
ジャーナルPhysical review letters
96
1
DOI
出版ステータスPublished - 2006 1月 13
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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