Theory of spin and orbital charge conversion at the surface states of Bi_{1-x}Sb_x topological insulator

• DOI: 10.48550/arxiv.2407.03120
• Publication Date: 2024-07-03
• Authors: Armando Pezo; Jean‐Marie George; H. Jaffrès
• Keywords: Topological insulator; Surface States

Topological insulators are quantum materials involving Time-reversal protected surface states(TSS) making them appealing candidates for the design of next generation highly efficient spintronic devices. The very recent observation large transient spin-charge conversion (SCC) and subsequent powerful THz emission from Co|Bi_{1-x}Sb_x bilayers clearly demonstrates such potentiality feasibility near future. Amongst exotic properties appearing in at materials, spin-momentum locking (SML) Rashba-Edelstein effects remain as key ingredients to effectively convert spin degree freedom into a charge or voltage signal. In this work, we extend our analyses quantification orbital momentum-locking related Bi.85Sb.15 via effects. that sense, will provide some clear theoretical numerical insights implemented by multi-orbital multi-layered tight-binding methods (TB) clarify experimental results obtained THz-TDS spectroscopy.