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

Author

Listed:
  • 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)
    Universität Duisburg-Essen)

  • Ying-Jun Chen

    (Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6)
    Universität Duisburg-Essen)

  • Vitaly Feyer

    (Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6)
    Universität Duisburg-Essen)

  • Jochen Geck

    (Technische Universität Dresden
    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)

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.

Suggested Citation

  • 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. M, 2022. "Fermi surface chirality induced in a TaSe2 monosheet formed by a Ta/Bi2Se3 interface reaction," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30093-1
    DOI: 10.1038/s41467-022-30093-1
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    References listed on IDEAS

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