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Title: Symmetrical transition of an atomic arrangement for 2D Bi films on Rh(111)
Authors: Yokoyama, M.
Liang, W.S.
Chen, W. 
Wee, A.T.S. 
Matsui, T.
Yuhara, J.
Keywords: 2D film
Surface structure
Symmetrical transition
Issue Date: Apr-2011
Citation: Yokoyama, M., Liang, W.S., Chen, W., Wee, A.T.S., Matsui, T., Yuhara, J. (2011-04). Symmetrical transition of an atomic arrangement for 2D Bi films on Rh(111). Surface Science 605 (7-8) : 844-847. ScholarBank@NUS Repository.
Abstract: The atomic arrangement of submonolayer Bi films on Rh(111) surface was examined using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). With low coverage, the LEED patterns showed incommensurate (IC) spots. The unit cell of IC was close to c(2 × 4) and had twofold symmetry. As the coverage increased, the unit cell shrank continuously along the [1̄10] direction, and the commensurate c(2 × 4) was formed at a coverage of 0.5 ML. At the coverage above 0.5 ML, two different structures of c(2 × 4) and (4 × 4) were observed by STM. When the surface is fully saturated by monolayer Bi atoms, Bi atoms formed the uniform (4 × 4) structure with sixfold symmetry. This is due to a strong Bi-Rh attractive interaction resulting in the two-dimensional localization of Bi adsorbates on the surface. As a result, a symmetrical transition of Bi films from twofold to sixfold symmetry occurred on Rh(111). © 2011 Elsevier B.V. All rights reserved.
Source Title: Surface Science
ISSN: 00396028
DOI: 10.1016/j.susc.2011.01.030
Appears in Collections:Staff Publications

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