| Autor: |
Dosenovic D; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France., Dechamps S; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France.; Institute of Condensed Matter and Nanosciences, Université catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium., Sharma K; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France., Rouviere JL; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France., Lu Y; Univ. Grenoble Alpes, CNRS-Institut Néel, F-38000 Grenoble, France., den Hertog MI; Univ. Grenoble Alpes, CNRS-Institut Néel, F-38000 Grenoble, France., Genovese L; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France., Dubois SM; Institute of Condensed Matter and Nanosciences, Université catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium., Charlier JC; Institute of Condensed Matter and Nanosciences, Université catholique de Louvain (UCLouvain), 1348 Louvain-la-Neuve, Belgium., Jamet M; Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC, 38000 Grenoble, France., Marty A; Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC, 38000 Grenoble, France., Okuno H; Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France. |
| Abstrakt: |
There has been extensive activity exploring the doping of semiconducting two-dimensional (2D) transition metal dichalcogenides in order to tune their electronic and magnetic properties. The outcome of doping depends on various factors, including the intrinsic properties of the host material, the nature of the dopants used, their spatial distribution, as well as their interactions with other types of defects. A thorough atomic-level analysis is essential to fully understand these mechanisms. In this work, the vanadium-doped WSe 2 monolayer grown by molecular beam epitaxy is investigated using four-dimensional scanning transmission electron microscopy (4D-STEM). Through center-of-mass-based reconstruction, atomic-scale maps are produced, allowing the visualization of both the electric field and the electrostatic potential around individual V atoms. To provide quantitative insights, these results are successfully compared to multislice image simulations based on ab initio calculations, accounting for lens aberrations. Finally, a negative charge around the V dopants is detected as a drop in the electrostatic potential, unambiguously demonstrating that 4D-STEM can be used to detect and to accurately analyze single-dopant charge states in semiconducting 2D materials. |
