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arXiv 1901.03095cond-mat.mtrl-scicond-mat.mes-hall
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直接与逆Edelstein效应的唯象模型

Phenomenological model for the direct and inverse Edelstein effects

Hironari Isshiki, Prasanta Muduli, Junyeon Kim, Kouta Kondou, YoshiChika Otani

AI总结:

本文提出连接直接与逆Edelstein效应的唯象模型,揭示两者转换系数的权衡关系,并提出由自旋轨道耦合和界面杂化强度构成的品质因数;在Bi2O3/Cu界面测得有效自旋霍尔角约0.09。

摘要:

我们开发了一个连接直接和逆Edelstein效应的唯象模型。我们的模型暗示了直接效应和逆效应的转换系数之间存在权衡关系。因此,逆效应的大转换系数并不必然带来直接效应的大转换系数。我们提出了一种Edelstein效应的品质因数,它由两个因素组成:一个代表自旋-轨道耦合的强度,另一个代表体态与界面态之间杂化的强度。这两者对于通过Edelstein效应进行高效转换都至关重要。为了测试我们的模型,我们使用非局域自旋阀结构中的自旋吸收方法,在Bi2O3/Cu界面测量了逆和直接Edelstein效应,并计算了转换系数。在该系统中,有效自旋霍尔角达到约0.09。这个相对较大的值不仅归因于大的自旋-轨道耦合,还归因于Bi2O3/Cu界面处界面态与体态之间的强杂化。

英文摘要:

We have developed a phenomenological model that connects the direct and the inverse Edelstein effects. Our model implies a trade-off relation between the conversion coefficients for the direct and inverse effects. Thus, a large conversion coefficient for the inverse effect does not necessarily bring a large conversion coefficient for the direct effect. Instead of these coefficients, we propose a figure of merit of Edelstein effects which consists of two factors; one of them represents the magnitude of the spin-orbit coupling, and the other represents the strength of the hybridization between bulk and interface states. Both of them are quit important for the efficient conversion through Edelstein effects. To test our model, we measured the inverse and direct Edelstein effects at the Bi2O3/Cu interface using spin absorption method with a non-local spin valve structure and calculated the conversion coefficients. The effective spin Hall angle reaches ~0.09 in this system. This relatively large value is attributable to not only the large spin-orbit coupling but also the strong hybridization between the interface and bulk states at the Bi2O3/Cu interface.

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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