论文标题
石墨烯超晶格中非本地手性电流的产生和控制轨道霍尔效应
Generation and control of non-local chiral currents in graphene superlattices by orbital Hall effect
论文作者
论文摘要
基于石墨烯的超晶格提供了一个新的材料游乐场，以利用和控制更高数量的电子自由度，例如电荷，旋转或山谷，用于破坏性技术。最近，轨道效应在缺乏反转对称性的Multivalley谱带结构中出现，已被讨论为开发轨道人的可能机制。在这里，我们报告了在小间隙HBN/石墨烯/HBNMoiré超晶格中的非本地传输测量值，该测量显示出非常强大的磁场引起的手性反应，这是稳定的，直至室温。非本地信号相对于磁场取向的测量符号依赖性清楚地表明了新兴的轨道磁矩的表现。实验数据的解释得到了数值模拟的很好的支持，报道的现象是对轨道信息横向流动的可靠方法，可以实现轨道设备的设计。
Graphene-based superlattices offer a new materials playground to exploit and control a higher number of electronic degrees of freedom, such as charge, spin, or valley for disruptive technologies. Recently, orbital effects, emerging in multivalley band structure lacking inversion symmetry, have been discussed as possible mechanisms for developing orbitronics. Here, we report non-local transport measurements in small gap hBN/graphene/hBN moiré superlattices which reveal very strong magnetic field-induced chiral response which is stable up to room temperature. The measured sign dependence of the non-local signal with respect to the magnetic field orientation clearly indicates the manifestation of emerging orbital magnetic moments. The interpretation of experimental data is well supported by numerical simulations, and the reported phenomenon stands as a formidable way of in-situ manipulation of the transverse flow of orbital information, that could enable the design of orbitronic devices.
