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• W3112754980 abstract "Spin-momentum locking in topological insulators and materials with Rashba-type interactions is an extremely attractive feature for novel spintronic devices and is therefore under intense investigation. Significant efforts are underway to identify new material systems with spin-momentum locking, but also to create heterostructures with new spintronic functionalities. In the present study we address both subjects and investigate a van der Waals-type heterostructure consisting of the topological insulator Bi2Se3 and a single Se-Ta-Se triple-layer (TL) of H-type TaSe2 grown by a method which exploits an interface reaction between the adsorbed metal and selenium. We then show, using surface x-ray diffraction, that the symmetry of the TaSe2-like TL is reduced from D3h to C3v resulting from a vertical atomic shift of the tantalum atom. Spin- and momentum-resolved photoemission indicates that, owing to the symmetry lowering, the states at the Fermi surface acquire an in-plane spin component forming a surface contour with a helical Rashba-like spin texture, which is coupled to the Dirac cone of the substrate. Our approach provides a route to realize chiral two-dimensional electron systems via interface engineering in van der Waals epitaxy that do not exist in the corresponding bulk materials." @default.
• W3112754980 created "2020-12-21" @default.
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• W3112754980 date "2022-05-05" @default.
• W3112754980 modified "2023-09-26" @default.
• W3112754980 title "Fermi surface chirality induced in a TaSe2 monosheet formed by a Ta/Bi2Se3 interface reaction" @default.
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• W3112754980 doi "https://doi.org/10.1038/s41467-022-30093-1" @default.
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• W3112754980 hasPublicationYear "2022" @default.
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