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Mapping the surface phase diagram of GaAs(001) using droplet epitaxy

Zheng, C. X. ; Hannikainen, K. ; Niu, Y. R. LU ; Tersoff, J. ; Gomez, D. ; Pereiro, J. and Jesson, D. E. (2019) In Physical Review Materials 3(12).
Abstract

We combine droplet epitaxy with low-energy electron microscopy imaging techniques to map the surface phase diagram of GaAs(001). The phase patterns produced in droplet epitaxy are interpreted using a simple model which links the spatial coordinates of phase boundaries to the free energy. It is thereby possible to gain important information on surface phase stability, based on the observed sequential order of the phases away from the droplet edge. This can be used to augment existing T=0K phase diagrams generated by density-functional theory calculations. We establish the existence of a (3×6) phase, and confirm that the controversial (6×6) phase is thermodynamically stable over a narrow range of chemical potential.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Materials
volume
3
issue
12
article number
124603
publisher
American Physical Society
external identifiers
  • scopus:85077361070
ISSN
2475-9953
DOI
10.1103/PhysRevMaterials.3.124603
language
English
LU publication?
yes
id
c57ed704-6bac-4713-a978-41360d126e37
date added to LUP
2020-01-20 12:24:22
date last changed
2022-04-18 20:15:43
@article{c57ed704-6bac-4713-a978-41360d126e37,
  abstract     = {{<p>We combine droplet epitaxy with low-energy electron microscopy imaging techniques to map the surface phase diagram of GaAs(001). The phase patterns produced in droplet epitaxy are interpreted using a simple model which links the spatial coordinates of phase boundaries to the free energy. It is thereby possible to gain important information on surface phase stability, based on the observed sequential order of the phases away from the droplet edge. This can be used to augment existing T=0K phase diagrams generated by density-functional theory calculations. We establish the existence of a (3×6) phase, and confirm that the controversial (6×6) phase is thermodynamically stable over a narrow range of chemical potential.</p>}},
  author       = {{Zheng, C. X. and Hannikainen, K. and Niu, Y. R. and Tersoff, J. and Gomez, D. and Pereiro, J. and Jesson, D. E.}},
  issn         = {{2475-9953}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{12}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Materials}},
  title        = {{Mapping the surface phase diagram of GaAs(001) using droplet epitaxy}},
  url          = {{http://dx.doi.org/10.1103/PhysRevMaterials.3.124603}},
  doi          = {{10.1103/PhysRevMaterials.3.124603}},
  volume       = {{3}},
  year         = {{2019}},
}