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• W3128436039 endingPage "4448" @default.
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• W3128436039 abstract "Density Functional Tight Binding (DFTB) is an attractive method for accelerated quantum simulations of condensed matter due to its enhanced computational efficiency over standard Density Functional Theory approaches. However, DFTB models can be challenging to determine for individual systems of interest, especially for metallic and interfacial systems where different bonding arrangements can lead to significant changes in electronic states. In this regard, we have created a rapid-screening approach for determining systematically improvable DFTB interaction potentials that can yield transferable models for a variety of conditions. Our method leverages a recent reactive molecular dynamics force field where many-body interactions are represented by linear combinations of Chebyshev polynomials. This allows for the efficient creation of multi-center representations with relative ease, requiring only a small investment in initial DFT calculations. We have focused our workflow on TiH$_2$ as a model system and show that a relatively small training set based on unit-cell sized calculations yields a model accurate for both bulk and surface properties. Our approach is easy to implement and can yield accurate DFTB models over a broad range of thermodynamic conditions, where physical and chemical properties can be difficult to interrogate directly and there is historically a significant reliance on theoretical approaches for interpretation and validation of experimental results." @default.
• W3128436039 created "2021-02-15" @default.
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• W3128436039 date "2021-06-15" @default.
• W3128436039 modified "2023-10-01" @default.
• W3128436039 title "Semi-Automated Creation of Density Functional Tight Binding Models through Leveraging Chebyshev Polynomial-Based Force Fields" @default.
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• W3128436039 doi "https://doi.org/10.1021/acs.jctc.1c00172" @default.
• W3128436039 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34128678" @default.
• W3128436039 hasPublicationYear "2021" @default.
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