Fermi surface chirality induced in a TaSe2 monosheet formed by a Ta/Bi2Se3 interface reaction

Andrey Polyakov, Katayoon Mohseni, Roberto Felici, Christian Tusche, Ying-Jun Chen, Vitaly Feyer, Jochen Geck, Tobias Ritschel, Arthur Ernst, Juan Rubio-Zuazo, German R. Castro, Holger L. Meyerheim () and Stuart S. P. Parkin
Additional contact information
Andrey Polyakov: Max-Planck-Institut für Mikrostukturphysik
Katayoon Mohseni: Max-Planck-Institut für Mikrostukturphysik
Roberto Felici: Consiglio Nazionale delle Ricerche - SPIN
Christian Tusche: Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6)
Ying-Jun Chen: Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6)
Vitaly Feyer: Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6)
Jochen Geck: Technische Universität Dresden
Tobias Ritschel: Technische Universität Dresden
Arthur Ernst: Johannes Kepler Universität
Juan Rubio-Zuazo: SpLine, Spanish CRG BM25 Beamline at the ESRF (The European Synchrotron)
German R. Castro: SpLine, Spanish CRG BM25 Beamline at the ESRF (The European Synchrotron)
Holger L. Meyerheim: Max-Planck-Institut für Mikrostukturphysik
Stuart S. P. Parkin: Max-Planck-Institut für Mikrostukturphysik

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-30093-1

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