Single-Layer Limit of Metallic Indium Overlayers on Si(111)
SCIE
SCOPUS
- Title
- Single-Layer Limit of Metallic Indium Overlayers on Si(111)
- Authors
- Park, JW; Kang, MH
- Date Issued
- 2016-09-08
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Density-functional calculations are used to identify one-atom-thick metallic In phases grown on the Si(111) surface, which have long been sought in quest of the ultimate two-dimensional (2D) limit of metallic properties. We predict two metastable single-layer In phases, one root 7 x root 3 phase with a coverage of 1.4 monolayer (ML; here 1 ML refers to one In atom per top Si atom) and the other root 7 x root 7 phase with 1.43 ML, which indeed agree with experimental evidences. Both phases reveal quasi-1D arrangements of protruded In atoms, leading to 2D-metallic but anisotropic band structures and Fermi surfaces. This directional feature contrasts with the free-electron-like In-overlayer properties that are known to persist up to the double-layer thickness, implying that the ultimate 2D limit of In overlayers may have been achieved in previous studies of double-layer In phases.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37053
- DOI
- 10.1103/PHYSREVLETT.117.116102
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 117, no. 11, page. 116102, 2016-09-08
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