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Title: Symmetry-based computational search for novel binary and ternary 2D materials
Author(s): Wang, Hai-Chen
Schmidt, JonathanLook up in the Integrated Authority File of the German National Library
Marques, MiguelLook up in the Integrated Authority File of the German National Library
Wirtz, LudgerLook up in the Integrated Authority File of the German National Library
Romero, Aldo H.
Issue Date: 2023
Type: Article
Language: English
Abstract: We present a symmetry-based systematic approach to explore the structural and compositional richness of two-dimensional materials. We use a 'combinatorial engine' that constructs candidate compounds by occupying all possible Wyckoff positions for a certain space group with combinations of chemical elements. These combinations are restricted by imposing charge neutrality and the Pauling test for electronegativities. The structures are then pre-optimized with a specially crafted universal neural-network force-field, before a final step of geometry optimization using density-functional theory is performed. In this way we unveil an unprecedented variety of two-dimensional materials, covering the whole periodic table in more than 30 different stoichiometries of form AnBm or AnBmCk. Among the discovered structures, we find examples that can be built by decorating nearly all Platonic and Archimedean tessellations as well as their dual Laves or Catalan tilings. We also obtain a rich, and unexpected, polymorphism for some specific compounds. We further accelerate the exploration of the chemical space of two-dimensional materials by employing machine-learning-accelerated prototype search, based on the structural types discovered in the systematic search. In total, we obtain around 6500 compounds, not present in previous available databases of 2D materials, with a distance to the convex hull of thermodynamic stability smaller than 250 meV/atom.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: 2D Materials
Publisher: IOP Publ.
Publisher Place: Bristol
Volume: 10
Original Publication: 10.1088/2053-1583/accc43
Appears in Collections:Open Access Publikationen der MLU

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