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arXiv 2012.10647cond-mat.mes-hallcond-mat.str-el
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非正交自旋-动量锁定

Non-orthogonal Spin-Momentum Locking

T. Hakioglu, Wei-Chi Chiu, R. S. Markiewicz, Bahadur Singh, A. Bansil

AI总结:

本研究揭示稀有无自旋杂质的自旋轨道散射可在强自旋轨道耦合材料中产生非正交自旋-动量锁定态,发现其存在耦合阈值,相关偏转角可通过S-ARPES提取,该理论适用于各类含杂质的强自旋轨道耦合体系。

摘要:

自旋-动量锁定是强自旋轨道耦合材料的独特本征特性,也是其在自旋电子学和量子计算领域具备应用潜力的关键。现有针对拓扑及非拓扑纯材料的大量研究,都聚焦于Γ点附近的正交锁定,即自旋与动量矢量的方向呈垂直锁定关系。正交锁定由纯体系的对称性所决定,尽管α-Sn的拓扑表面已报道存在非正交自旋-动量锁定(NOSML)现象,但导致该现象的机制却鲜少受到关注。本文研究表明,当本征材料存在强本征自旋轨道耦合时,由稀有无自旋杂质引发的自旋轨道散射可产生NOSML态,同时还观测到NOSML态出现存在一个有趣的耦合阈值。我们分析中的相关参数是偏离正交态的偏转角,该参数可通过自旋-角分辨光电子能谱(S-ARPES)实验提取。本文的理论形式适用于所有含杂质的强自旋轨道耦合体系,而不仅限于拓扑体系。对NOSML的理解关系到各类依赖自旋轨道的现象,包括自旋-电荷转换问题,以及一般自旋轨道耦合材料中准粒子干涉(QPI)图案和扫描隧道谱(STS)的解读。

英文摘要:

Spin-momentum locking is a unique intrinsic feature of strongly spin-orbit coupled materials and a key to their promise of applications in spintronics and quantum computation. Much of the existing work, in topological and non-topological pure materials, has been focused on the orthogonal locking in the vicinity of the $Γ$ point where the directions of spin and momentum vectors are locked perpendicularly. With the orthogonal case, enforced by the symmetry in pure systems, mechanisms responsible for non-orthogonal spin-momentum locking (NOSML) have drawn little attention, although it has been reported on the topological surface of $α$-$Sn$. Here, we demonstrate that, the presence of the spin-orbit scattering from dilute spinless impurities can produce the NOSML state in the presence of a strong intrinsic spin-orbit coupling in the pristine material. We also observe an interesting coupling threshold for the NOSML state to occur. The relevant parameter in our analysis is the deflection angle from orthogonality which can be extracted experimentally from the spin-and-angle-resolved photoemission (S-ARPES) spectra. Our formalism is applicable to all strongly spin-orbit coupled systems with impurities and not limited to topological ones. The understanding of NOSML bears on spin-orbit dependent phenomena, including issues of spin-to-charge conversion and the interpretation of quasiparticle interference (QPI) patterns as well as scanning-tunneling spectra (STS) in general spin-orbit coupled materials.

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。

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