论文标题
由于石墨烯中Rashba效应而导致的G因子的降低
Reduction of g-factor due to Rashba effect in graphene
论文作者
论文摘要
石墨烯是自旋电子领域中高度有希望的材料。关于电子自旋共振的最新实验已经观察到石墨烯的G因子的降低。在我们以前的论文中[J。物理。 Soc。 JPN。 88，094707（2019）]，我们证明了这种还原的来源之一是石墨烯的磁性特性。但是，磁性特性本身并不能完全解释实验中观察到的还原的幅度。在本文中，我们专注于Rashba效应，这是由石墨烯表面附近的工作函数引起的。 Rashba效应将自旋磁矩倾斜到石墨烯片的平面方向，可能会减少G因子。我们使用结合Rashba和Spin Zeeman效果的简单模型系统评估了这种还原。然后，我们证明了所得的G因子与先前实验中观察到的g型密切一致，这表明Rashba效应能够说明石墨烯G因子的剩余降低。
Graphene is a highly promising material in the field of spin electronics. Recent experiments on electron spin resonance have observed a reduction in the g-factor of graphene. In our previous paper [J. Phys. Soc. Jpn. 88, 094707 (2019)], we demonstrated that one of sources for this reduction is the diamagnetic property of graphene. However, the diamagnetic property by itself does not fully account for the magnitude of the reduction observed in the experiments. In this paper, we focus on the Rashba effect, which is caused by the work function existing near the surface of graphene. The Rashba effect tilts the spin magnetic moment to the in-plane direction of the graphene sheet, potentially reducing the g-factor. We evaluate this reduction using a simple model system incorporating the Rashba and spin Zeeman effects. We then demonstrate that the resultant g-factor is in close agreement with that observed in the prior experiments, indicating that the Rashba effect is able to account for the remaining reduction in the g-factor of graphene.
