Fermi surface chirality induced in a TaSe2 monosheet formed by a Ta/Bi2Se3 interface reaction
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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.
Details
Original language | English |
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Article number | 2472 |
Journal | Nature communications |
Volume | 13 |
Issue number | 1 |
Publication status | Published - Dec 2022 |
Peer-reviewed | Yes |
External IDs
PubMed | 35513364 |
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ORCID | /0000-0002-2438-0672/work/158767750 |