Pré-Publication, Document De Travail Année : 2024

Theory of spin and orbital charge conversion at the surface states of Bi 1 − x Sb x topological insulator

Résumé

Topological insulators are quantum materials involving time-reversal protected surface states making them appealing candidates for the design of the next generation of highly efficient spintronic devices. The very recent observation of large transient spin-charge conversion and subsequent powerful THz emission from Co / Bi 1 − x Sb x bilayers clearly demonstrates such potentiality and feasibility for the near future. Among the exotic properties appearing in and at the surface of such quantum materials, spin-momentum locking and Rashba-Edelstein effects remain as key ingredients to effectively convert the spin degree of freedom into a charge or a voltage signal. In this work, we extend our analyses to the quantification of orbital momentum-locking and related orbital charge conversion effects in Bi . 85 Sb . 15 via orbital Rashba-Edelstein effects. In that sense, we will provide some clear theoretical and numerical insights implemented by multiorbital and slab tight-binding methods to clarify our recent experimental results obtained by THz spectroscopy in the time domain. Published by the American Physical Society 2024
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hal-04895937 , version 1 (19-01-2025)

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Armando Pezo, Jean-Marie George, Henri Jaffrès. Theory of spin and orbital charge conversion at the surface states of Bi 1 − x Sb x topological insulator. 2025. ⟨hal-04895937⟩
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