arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2407.03120cond-mat.mes-hall
收藏

Bi_{1-x}Sb_x拓扑绝缘体表面态的自旋与轨道电荷转换理论

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

Armando Pezo, Jean-Marie George, Henri Jaffrès

AI总结:

本文通过多轨道紧束缚方法研究了Bi_{0.85}Sb_{0.15}拓扑绝缘体表面态中的轨道动量锁定与轨道Rashba-Edelstein电荷转换效应,为解释THz-TDS实验中的自旋-电荷转换现象提供理论依据。

摘要:

拓扑绝缘体是包含时间反演保护表面态(TSS)的量子材料,使其成为设计下一代高效自旋电子器件的有吸引力的候选者。最近在Co|Bi_{1-x}Sb_x双层中观察到的大瞬态自旋-电荷转换(SCC)以及随后产生的强太赫兹发射,清楚地展示了这种潜力和近期可行性。在此类量子材料内部及其表面出现的奇异性质中,自旋-动量锁定(SML)和Rashba-Edelstein效应仍然是有效将自旋自由度转换为电荷或电压信号的关键要素。在这项工作中,我们将分析扩展到通过轨道Rashba-Edelstein效应量化Bi_{0.85}Sb_{0.15}中的轨道动量锁定和相关的轨道电荷转换效应。在此意义上,我们将提供一些清晰的理论和数值见解,这些见解通过多轨道和多层紧束缚方法(TB)实现,以阐明我们最近通过THz-TDS光谱获得的实验结果。

英文摘要:

Topological insulators are quantum materials involving Time-reversal protected surface states(TSS) making them appealing candidates for the design of next generation of highly efficient spintronic devices. The very recent observation of large transient spin-charge conversion (SCC) and subsequent powerful THz emission from Co|Bi_{1-x}Sb_x bilayers clearly demonstrates such potentiality and feasibility for the near future. Amongst the exotic properties appearing in and at the surface of such quantum materials, spin-momentum locking (SML) 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_{0.85}Sb_{0.15} via orbital Rashba-Edelstein effects. In that sense, we will provide some clear theoretical and numerical insights implemented by multi-orbital and multi-layered tight-binding methods (TB) to clarify our recent experimental results obtained by THz-TDS spectroscopy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑