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Dynamically generated pure spin current in single-layer graphene

机译：单层石墨烯中动态产生的纯自旋电流

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摘要

The conductance mismatch problem limits the spin-injection efficiency significantly, and spin injection into graphene usually requires high-quality tunnel barriers to circumvent the conductance mismatch. We introduce an approach which enables the generation of pure spin current into single-layer graphene (SLG) that is free from electrical conductance mismatch by using dynamical spin injection. An experimental demonstration of spin-pumping-induced spin current generation and spin transport in SLG at room temperature was successfully achieved, and the spin coherence length was estimated to be 1.36 μm by using a conventional theoretical model based on the Landau-Lifshitz-Gilbert equation. The spin coherence length is proportional to the quality of SLG, which indicates that spin relaxation in SLG is governed by the Elliot-Yafet mechanism, as was reported.
机译：电导不匹配问题极大地限制了自旋注入效率，并且自旋注入石墨烯通常需要高质量的隧道势垒来规避电导不匹配。我们介绍了一种方法，该方法可以通过使用动态自旋注入将纯自旋电流生成为单层石墨烯（SLG），而不会出现电导率不匹配的情况。成功地实现了自旋泵激自旋电流在室温下在SLG中产生和自旋输运的实验演示，并且使用基于Landau-Lifshitz-Gilbert方程的常规理论模型估计自旋相干长度为1.36μm 。自旋相干长度与SLG的质量成正比，这表明SLG中的自旋弛豫受Elliot-Yafet机制控制，如所报道的那样。

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