Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale
Abstract Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom spatial resolution. These electric field maps represent the integrated effect of the nucleus, core electrons and va...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-07-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-39304-9 |
| _version_ | 1797774078887591936 |
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| author | Joel Martis Sandhya Susarla Archith Rayabharam Cong Su Timothy Paule Philipp Pelz Cassandra Huff Xintong Xu Hao-Kun Li Marc Jaikissoon Victoria Chen Eric Pop Krishna Saraswat Alex Zettl Narayana R. Aluru Ramamoorthy Ramesh Peter Ercius Arun Majumdar |
| author_facet | Joel Martis Sandhya Susarla Archith Rayabharam Cong Su Timothy Paule Philipp Pelz Cassandra Huff Xintong Xu Hao-Kun Li Marc Jaikissoon Victoria Chen Eric Pop Krishna Saraswat Alex Zettl Narayana R. Aluru Ramamoorthy Ramesh Peter Ercius Arun Majumdar |
| author_sort | Joel Martis |
| collection | DOAJ |
| description | Abstract Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom spatial resolution. These electric field maps represent the integrated effect of the nucleus, core electrons and valence electrons, and separating their contributions is non-trivial. In this paper, we utilized simultaneously acquired 4D-STEM center of mass (CoM) images and annular dark field (ADF) images to determine the projected electron charge density in monolayer MoS2. We evaluate the contributions of both the core electrons and the valence electrons to the derived electron charge density; however, due to blurring by the probe shape, the valence electron contribution forms a nearly featureless background while most of the spatial modulation comes from the core electrons. Our findings highlight the importance of probe shape in interpreting charge densities derived from 4D-STEM and the need for smaller electron probes. |
| first_indexed | 2024-03-12T22:15:48Z |
| format | Article |
| id | doaj.art-4a106ab2b36f4ca59ca8339102c9b4c3 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-12T22:15:48Z |
| publishDate | 2023-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-4a106ab2b36f4ca59ca8339102c9b4c32023-07-23T11:19:19ZengNature PortfolioNature Communications2041-17232023-07-011411810.1038/s41467-023-39304-9Imaging the electron charge density in monolayer MoS2 at the Ångstrom scaleJoel Martis0Sandhya Susarla1Archith Rayabharam2Cong Su3Timothy Paule4Philipp Pelz5Cassandra Huff6Xintong Xu7Hao-Kun Li8Marc Jaikissoon9Victoria Chen10Eric Pop11Krishna Saraswat12Alex Zettl13Narayana R. Aluru14Ramamoorthy Ramesh15Peter Ercius16Arun Majumdar17Department of Mechanical Engineering, Stanford UniversityThe National Center for Electron Microscopy (NCEM), The Molecular Foundry, Lawrence Berkeley National LaboratoryDepartment of Mechanical Engineering, University of Illinois at Urbana-ChampaignDepartment of Physics, University of California BerkeleyDepartment of Physics, University of California BerkeleyThe National Center for Electron Microscopy (NCEM), The Molecular Foundry, Lawrence Berkeley National LaboratoryDepartment of Electrical Engineering, Stanford UniversityDepartment of Mechanical Engineering, Stanford UniversityDepartment of Mechanical Engineering, Stanford UniversityDepartment of Electrical Engineering, Stanford UniversityDepartment of Electrical Engineering, Stanford UniversityDepartment of Electrical Engineering, Stanford UniversityDepartment of Electrical Engineering, Stanford UniversityDepartment of Physics, University of California BerkeleyDepartment of Mechanical Engineering, The University of Texas at AustinDepartment of Physics, University of California BerkeleyThe National Center for Electron Microscopy (NCEM), The Molecular Foundry, Lawrence Berkeley National LaboratoryDepartment of Mechanical Engineering, Stanford UniversityAbstract Four-dimensional scanning transmission electron microscopy (4D-STEM) has recently gained widespread attention for its ability to image atomic electric fields with sub-Ångstrom spatial resolution. These electric field maps represent the integrated effect of the nucleus, core electrons and valence electrons, and separating their contributions is non-trivial. In this paper, we utilized simultaneously acquired 4D-STEM center of mass (CoM) images and annular dark field (ADF) images to determine the projected electron charge density in monolayer MoS2. We evaluate the contributions of both the core electrons and the valence electrons to the derived electron charge density; however, due to blurring by the probe shape, the valence electron contribution forms a nearly featureless background while most of the spatial modulation comes from the core electrons. Our findings highlight the importance of probe shape in interpreting charge densities derived from 4D-STEM and the need for smaller electron probes.https://doi.org/10.1038/s41467-023-39304-9 |
| spellingShingle | Joel Martis Sandhya Susarla Archith Rayabharam Cong Su Timothy Paule Philipp Pelz Cassandra Huff Xintong Xu Hao-Kun Li Marc Jaikissoon Victoria Chen Eric Pop Krishna Saraswat Alex Zettl Narayana R. Aluru Ramamoorthy Ramesh Peter Ercius Arun Majumdar Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale Nature Communications |
| title | Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale |
| title_full | Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale |
| title_fullStr | Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale |
| title_full_unstemmed | Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale |
| title_short | Imaging the electron charge density in monolayer MoS2 at the Ångstrom scale |
| title_sort | imaging the electron charge density in monolayer mos2 at the angstrom scale |
| url | https://doi.org/10.1038/s41467-023-39304-9 |
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