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The two‐dimensional layered materials such as graphene and transition metal dichalcogenides reveal the unique structure of the electron‐hole spectrum that generates discrete degrees of freedom related to the electron spin and the valley pseudospin. Optical phonons with the angular momentum may induce the transitions between the quantum levels in this system. Therefore, the investigation of these phonons...
Strain in SiGeSn alloy layers with thicknesses of d = 1.5 and 2.0 nm grown in a Si matrix by molecular-beam epitaxy is investigated using the geometric-phase analysis of high-resolution electron microscopy images. The layer thickness is comparable to the spatial resolution of the method (Δ ~ 1 nm), which leads to a considerable distortion of the strain distribution profile and an error in determining...
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