论文标题
双层石墨烯中的自旋大厅效应与绝缘体结合到室温
Spin Hall Effect in Bilayer Graphene Combined with an Insulator up to Room Temperature
论文作者
论文摘要
可以通过化学功能化，ADATOM装饰或与范德华材料近端来增强石墨烯中的自旋轨道耦合。正如预期的那样，这种增强能够引起较大的自旋大厅效应，这是一种技术相关性的旋转电流转换现象，它引发了广泛的研究兴趣。但是，它仅在石墨烯/过渡金属二甲硅烷基范德华异质结构中进行测量，可扩展性有限。在这里，我们在实验上证明了双层石墨烯中的旋转霍尔效应至室温，并结合了非磁性绝缘子，氧化二氧化碳层。测得的自旋效应最有可能通过外在机制提高。凭借较大的自旋转换效率，可扩展性和与电子设备的集成易用性，我们展示了适合基于自旋设备应用的有希望的材料异质结构。
Spin-orbit coupling in graphene can be enhanced by chemical functionalization, adatom decoration or proximity with a van der Waals material. As it is expected that such enhancement gives rise to a sizeable spin Hall effect, a spin-to-charge current conversion phenomenon of technological relevance, it has sparked wide research interest. However, it has only been measured in graphene/transition metal dichalcogenide van der Waals heterostructures with limited scalability. Here, we experimentally demonstrate spin Hall effect up to room temperature in bilayer graphene combined with a nonmagnetic insulator, an evaporated bismuth oxide layer. The measured spin Hall effect raises most likely from an extrinsic mechanism. With a large spin-to-charge conversion efficiency, scalability, and ease of integration to electronic devices, we show a promising material heterostructure suitable for spin-based device applications.
