Observation of a quasi-1D Mott-Hubbard insulator: The re-entrant Na/Si(111)-3 x 1 surface
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- Title
- Observation of a quasi-1D Mott-Hubbard insulator: The re-entrant Na/Si(111)-3 x 1 surface
- Authors
- Ahn, JR; Kim, ND; Lee, SS; Lee, KD; Yu, BD; Jeon, D; Kong, K; Chung, JW
- Date Issued
- 2002-03
- Publisher
- E D P SCIENCES
- Abstract
- We have investigated the origin of a semiconducting phase of the re-entrant Na/Si(111)-3 x 1 surface formed by adding extra adatoms on the earlier 3 x 1 phase at 1/3 monolayers (MLs). The additional Na adatoms are found to form quasi-one-dimensional (1D) atomic chains in our scanning tunnelling microscopy images while keeping the surface semiconducting. The unique features in our valence band and in high-resolution electron-energy-loss spectra suggest that the re-entrant 3 x 1 surface is a Mott-Hubbard type insulator. We thus report a novel quasi-1D insulator-insulator transition where electron-electron correlation plays a decisive role.
- Keywords
- ALKALI-METALS; ELECTRONIC-STRUCTURE; SI(111) SURFACE; RECONSTRUCTION; FILMS; NA
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19161
- DOI
- 10.1209/epl/i2002-00589-8
- ISSN
- 0295-5075
- Article Type
- Article
- Citation
- EUROPHYSICS LETTERS, vol. 57, no. 6, page. 859 - 865, 2002-03
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- There are no files associated with this item.
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