Aperiodic defects in periodic solids
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arXiv
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| Format: | Preprint |
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2024
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| author | Lavroff, Robert H. Kats, Daniel Maschio, Lorenzo Bogdanov, Nikolay A. Alavi, Ali Alexandrova, Anastassia N. Usvyat, Denis |
| author_facet | Lavroff, Robert H. Kats, Daniel Maschio, Lorenzo Bogdanov, Nikolay A. Alavi, Ali Alexandrova, Anastassia N. Usvyat, Denis |
| contents | To date, computational methods for modeling defects (vacancies, adsorbates, etc.) rely on periodic supercells in which the defect is far enough from its repeated image such that they can be assumed non-interacting. Yet, the relative proximity and periodic repetition of the defect's images may lead to spurious, unphysical artifacts, especially if the defect is charged and/or open-shell, causing a very slow convergence to the thermodynamic limit (TDL). In this Letter, we introduce a "defectless" embedding formalism such that the embedding field is computed in a pristine, primitive-unit-cell calculation. Subsequently, a single (i.e. "aperiodic") defect, which can also be charged, is introduced inside the embedded fragment. By eliminating the need for compensating background charges and periodicity of the defect, we circumvent all associated unphysicalities and numerical issues, achieving a very fast convergence to the TDL. Furthermore, using the toolbox of post-Hartree-Fock methods, this scheme can be straightforwardly applied to study strongly correlated defects, localized excited states and other problems, for which existing periodic protocols do not provide a satisfactory description. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_03373 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Aperiodic defects in periodic solids Lavroff, Robert H. Kats, Daniel Maschio, Lorenzo Bogdanov, Nikolay A. Alavi, Ali Alexandrova, Anastassia N. Usvyat, Denis Chemical Physics Materials Science Strongly Correlated Electrons To date, computational methods for modeling defects (vacancies, adsorbates, etc.) rely on periodic supercells in which the defect is far enough from its repeated image such that they can be assumed non-interacting. Yet, the relative proximity and periodic repetition of the defect's images may lead to spurious, unphysical artifacts, especially if the defect is charged and/or open-shell, causing a very slow convergence to the thermodynamic limit (TDL). In this Letter, we introduce a "defectless" embedding formalism such that the embedding field is computed in a pristine, primitive-unit-cell calculation. Subsequently, a single (i.e. "aperiodic") defect, which can also be charged, is introduced inside the embedded fragment. By eliminating the need for compensating background charges and periodicity of the defect, we circumvent all associated unphysicalities and numerical issues, achieving a very fast convergence to the TDL. Furthermore, using the toolbox of post-Hartree-Fock methods, this scheme can be straightforwardly applied to study strongly correlated defects, localized excited states and other problems, for which existing periodic protocols do not provide a satisfactory description. |
| title | Aperiodic defects in periodic solids |
| topic | Chemical Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.03373 |