Phys.org July 3, 2024 When the tilting angles are arbitrary, the grain boundaries in atomically thin van der Waals materials form inhomogeneous sublattices, giving rise to local electronic states that are not controlled. An international team of researchers (Korea, USA – Harvard University) has reported on epitaxial realizations of deterministic MoS2 mirror twin boundaries (MTBs) at which two adjoining crystals are reflection mirroring by an exactly 60° rotation by position-controlled epitaxy. They showed that these epitaxial MTBs were one-dimensionally metallic to a circuit length scale. They incorporated the epitaxial MTBs as a 1D gate to build integrated two-dimensional field-effect transistors […]
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Precision experiments reveal gaps in van der Waals theory
Science Daily February 16, 2018 An international team of researchers (Denmark, Japan) measured a single TiS2 crystal to show that the interlayer interactions are in fact stronger than theory indicates, and involve significant electron sharing. The outstanding agreement of the synchrotron diffraction data with theoretical calculations in describing the intralayer Ti-S interactions, supports the validity of these new-found differences for the long-range interactions across the interlayer gaps. The research contributes to the fundamental understanding of weak chemical bonding in 2D layered materials in general, and to the development of TMD materials… read more. TECHNICAL ARTICLE