Communication Dans Un Congrès Année : 2023

Spin-momentum locking and ultrafast spin-charge conversion in ultrathin epitaxial Bi 1-x Sb x topological insulator

Résumé

We combine spin- and angle-resolved photoemission spectroscopy, and time-resolved THz emission spectroscopy to evidence that spin-charge conversion arises mainly from the surface state in Bi1−xSbx ultrathin films, down to few nanometers where confinement effects emerge. We correlate this large conversion efficiency, typically at the level of the bulk spin Hall effect from heavy metals, to the complex Fermi surface obtained from theoretical calculations of the inverse Rashba-Edelstein response. Both surface state robustness and sizeable conversion efficiency in epitaxial Bi1-x Sbx thin films bring new perspectives for ultra-low power magnetic random-access memories and broadband THz generation.

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Dates et versions

hal-05015439 , version 1 (01-04-2025)

Identifiants

Citer

E. Rongione, L. Baringthon, D. She, G. Patriarche, R. Lebrun, et al.. Spin-momentum locking and ultrafast spin-charge conversion in ultrathin epitaxial Bi 1-x Sb x topological insulator. 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Sep 2023, Montreal, France. pp.1-2, ⟨10.1109/IRMMW-THz57677.2023.10299093⟩. ⟨hal-05015439⟩
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