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Spin-momentum locking in topological insulators and materials withRashba-type interactions is an extremely attractive feature for novelspintronic devices and is therefore under intense investigation. Significantefforts are underway to identify new material systems with spin-momentumlocking, but also to create heterostructures with new spintronicfunctionalities. In the present study we address both subjects and investigatea van der Waals-type heterostructure consisting of the topological insulatorBi$_{2}$Se$_{3}$ and a single Se-Ta-Se triple-layer (TL) of H-type TaSe$_{2}$grown by a novel method which exploits an interface reaction between theadsorbed metal and selenium. We then show, using surface x-ray diffraction,that the symmetry of the TaSe2-like TL is reduced from D$_{3h}$ to C$_{3v}$resulting from a vertical atomic shift of the tantalum atom. Spin- andangle-resolved photoemission indicates that, owing to the symmetry lowering,the states at the Fermi surface acquire an in-plane spin component forming asurface contour with a helical Rashba-like spin texture, which is coupled tothe Dirac cone of the substrate. Our approach provides a new route to realizenovel chiral two-dimensional electron systems via interface engineering that donot exist in the corresponding bulk materials.

Fermi surface chirality induced in a TaSe$_{2}$ monosheet formed by a Ta/ Bi$_{2}$Se$_{3}$ interface reaction