OBSERVATION OF DISORDER-INDUCED 2D MOTT-HUBBARD STATES OF THE ALKALI-EARTH METAL (MG,BA)-ADSORBED SI(111) SURFACE
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SCOPUS
- Title
- OBSERVATION OF DISORDER-INDUCED 2D MOTT-HUBBARD STATES OF THE ALKALI-EARTH METAL (MG,BA)-ADSORBED SI(111) SURFACE
- Authors
- Ahn, JR; Lee, SS; Kim, ND; Min, JH; Hwang, CG; Chung, JW
- Date Issued
- 2000-02-21
- Publisher
- AMERICAN PHYSICAL SOC
- Abstract
- We report evidence of a disorder-driven Mott-Hubbard-type localization on the alkali-earth metal (AEM) (Mg,Ba)-adsorbed Si(111)-(7 X 7) surface. The clean metallic Si(111) surface is found to undergo a two-dimensional (2D) metal-insulator transition as randomly distributed AEM adsorbates cause disorder on the surface. A well-defined electron-energy-loss peak unique to the insulating phase is attributed to an interband excitation between the split Hubbard bands originated from a metallic surface band at Fermi energy. A quantitative analysis of the loss peak reveals that the AEM-induced insulating surfaces are of a Mott-Hubbard type driven essentially by disorder.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12414
- DOI
- 10.1103/PhysRevLett.84.1748
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 84, no. 8, page. 1748 - 1751, 2000-02-21
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