Theory of spin and orbital charge conversion at the surface states of Bi1-xSbx topological insulator

被引:0
|
作者
Pezo, Armando [1 ]
George, Jean-Marie [1 ]
Jaffres, Henri [1 ]
机构
[1] Univ Paris Saclay, Lab Albert Fert, CNRS, Thales, F-91767 Palaiseau, France
来源
PHYSICAL REVIEW RESEARCH | 2024年 / 6卷 / 04期
关键词
ELECTRONIC-STRUCTURE;
D O I
10.1103/PhysRevResearch.6.043332
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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/Bi1-xSbx 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.85Sb.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.
引用
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页数:11
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