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Commensurate-incommensurate transition and domain wall dynamics of adsorbed overlayers on a honeycomb substrate

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posted on 19.01.2018, 09:46 authored by Ken R. Elder, C.V. Achim, E. Granato, S.C. Ying, Tapio Ala-NissilaTapio Ala-Nissila
© EPLA, 2016.We introduce an effective one-mode phase-field crystal model for studying the commensurate-incommensurate transition and domain wall dynamics of the ( √ 3×√3)R30 phase found in systems such as Xe/Pt(111), or Xe and Kr on graphite. The model allows us to study large systems where the domain walls can be separated over large macroscopic distances and at the same time incorporate the microscopic details of the domain wall structures. The resulting phase diagram shows that an intermediate stripe incommensurate phase always separates the commensurate phase from the honeycomb incommensurate phases. The energy of the domain wall crossing is investigated. We also find that near a step edge, the domain walls tend to align perpendicularly to the step edge, in agreement with recent experimental observations.

Funding

This work was supported by the Sao Paulo Research Foundation (FAPESP, Grant No. 2014/15372-3) (E.G.), the CNPq (Brazi) (E.G.), the Watson Institute at Brown University under a Brazil Collaborative Grant (S.-C.Y.) and the National Science Foundation under Grant No. DMR-1506634 (K.R.E.) . CVA acknowledges financial support from CRHIAM-FONDAPCONICYT Project 15130015. T.A-N. acknowledges partial support from Aalto Science Institute and the Academy of Finland though grants nos. 251748 and 284621.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

EPL

Volume

116

Issue

5

Citation

ELDER, K.R. ...et al., 2017. Commensurate-incommensurate transition and domain wall dynamics of adsorbed overlayers on a honeycomb substrate. EPL, 116: 56002.

Publisher

© EPLA

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

22/12/2016

Publication date

2017

Notes

This paper was accepted for publication in the journal EPL and the definitive published version is available at https://doi.org/10.1209/0295-5075/116/56002

ISSN

0295-5075

eISSN

1286-4854

Language

en

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