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arXiv 1804.04992cond-mat.mes-hall
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门控多层膜InSe中Rashba自旋轨道耦合的调谐

Tuning Rashba Spin-Orbit Coupling in Gated Multilayer InSe

Kasun Premasiri, Santosh Kumar Radha, Sukrit Sucharitakul, U. Rajesh Kumar, Raman Sankar, Fang-Cheng Chou, Yit-Tsong Chen, Xuan P. A. Gao

摘要:

利用自旋-轨道耦合(SOC)操纵电子自旋是自旋电子学的一个重要组成部分。静电门控具有强SOC的材料导致有效的磁场,该磁场又可以用于控制电子自旋。在这项工作中,我们报告的存在和静电调谐Rashba SOC多层InSe。在InSe的量子输运研究中,我们观察到了从弱局域化(WL)到弱反局域化(WAL)效应的栅电压调谐交叉,这表明SOC强度增加。磁输运研究和能带图计算的定量分析提供了强有力的证据,Rashba SOC的优势,在静电门控InSe。此外,我们属性的SOC强度的趋势,饱和在高栅极电压的增加的电子密度的状态诱导饱和的电场所经历的InSe层中的电子。Rashba SOC的非线性栅极电压控制的这种解释可以推广到其他静电门控半导体纳米材料,其中观察到类似的自旋轨道长度饱和趋势(例如纳米线场效应晶体管),因此在自旋电子学中具有广泛的意义。在InSe中识别和控制Rashba SOC可以在未来设计基于III-VI族半导体的自旋电子器件中起关键作用。

英文摘要:

Manipulating the electron spin with the aid of spin-orbit coupling (SOC) is an indispensable element of spintronics. Electrostatically gating a material with strong SOC results in an effective magnetic field which can in turn be used to govern the electron spin. In this work, we report the existence and electrostatic tunability of Rashba SOC in multilayer InSe. We observed a gate-voltage-tuned crossover from weak localization (WL) to weak antilocalization (WAL) effect in quantum transport studies of InSe, which suggests an increasing SOC strength. Quantitative analyses of magneto-transport studies and energy band diagram calculations provide strong evidence for the predominance of Rashba SOC in electrostatically gated InSe. Furthermore, we attribute the tendency of the SOC strength to saturate at high gate voltages to the increased electronic density of states-induced saturation of the electric field experienced by the electrons in the InSe layer. This explanation of nonlinear gate voltage control of Rashba SOC can be generalized to other electrostatically gated semiconductor nanomaterials in which a similar tendency of spin-orbit length saturation was observed (e.g. nanowire field effect transistors), and is thus of broad implications in spintronics. Identifying and controlling the Rashba SOC in InSe may serve pivotally in devising III-VI semiconductor-based spintronic devices in the future.

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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