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O: Fachverband Oberflächenphysik
O 70: 2D materials: Stacking and heterostructures – Poster (joint session O/TT)
O 70.2: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Superdomains and Strain Localization in Twisted Two Dimensional Transition Metal Dichalcogenides — •Riya Patel1, Daniel Wolf1, Kristina Weinel1,2, Silke Hampel1, and Axel Lubk1,2 — 1IFF, IFW Dresden, 01069 Dresden — 2Faculty of Physics, Technical University Dresden, 01069 Dresden
Bilayers of 2D transition metal dichalcogenides (TMDCs) exhibit special structural and electronic phenomena when stacked with a low-twist-angle. Particularly, they undergo lattice reconstruction, forming large triangular stacking domains, separated by domain walls that concentrate strain (soliton regime), which was shown in simulations. However, direct experimental quantification of these strain features and their correlation with electronic properties remains limited. Here we investigate low-twist-angle TMDCs using high-resolution transmission electron microscopy to visualize the reconstructed super lattice and identify the resulting superdomains structure. We employ geometric phase analysis to quantitatively map the strain distribution at the domain walls with nanometer resolution, revealing spatial maps of different strain components. We use Electron Energy Loss Spectroscopy to further probe the electronic properties of the reconstructed system. The understanding of strain localization in superdomain structures and the related electronic properties in such systems facilitate strain-engineered electronic properties in twisted TMDCs.
Keywords: Twisted TMDCs; Superdomains; Strain Localization; STEM-EELS