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Higher order reconstructions of the Ge(001) surface induced by a Ba layer

Koczorowski, W; Grzela, T; Puchalska, A; Radny, MW; Jurczyszyn, L; Schofield, SR; Czajka, R; (2018) Higher order reconstructions of the Ge(001) surface induced by a Ba layer. Applied Surface Science , 435 pp. 438-443. 10.1016/j.apsusc.2017.11.058. Green open access

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Abstract

Structural properties of Ba-induced reconstructions on a Ge(001) surface, based on atomic-resolution ultra high-vacuum scanning tunneling microscopy measurements, are discussed. It is shown that while the Ba - Ge layer, which fully covers the surface, is dominated by a phase with an internal 2 × 3 periodicity, it also includes portions of higher order 2 × 6 and 4 × 3 surface reconstructions, always accompanied by 1D protrusions embedded into the dominating phase. Modelling the observed higher order structures, using the elementary cell of the 2 × 3 phase calculated within the density functional theory, is shown to reproduce the experimental data very well. As such the higher order reconstructions can be treated as local defects of the dominating 2 × 3 phase.

Type: Article
Title: Higher order reconstructions of the Ge(001) surface induced by a Ba layer
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apsusc.2017.11.058
Publisher version: http://doi.org/10.1016/j.apsusc.2017.11.058
Language: English
Additional information: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Ba-Ge surface alloy; Ge(001); Ultra-high vacuum scanning tunneling microscopy (UHV STM)
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10039657
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