论文标题
在封装的石墨烯特斯拉阀中通过流体动力流进行纠正
Rectification by hydrodynamic flow in an encapsulated graphene Tesla valve
论文作者
论文摘要
颗粒间相互作用的系统可以通过流体动力学来描述。在电子的固态中，这种制度通常很难访问。然而，封装的石墨烯的高纯度与其有利的声子特性相结合，并且已经观察到了对石墨烯电导率的流体动力校正。示例包括电子漩涡，通过收缩以及Poiseuille流量轮廓增强的流动。但是，缺乏专门依靠粘性行为和充当粘度计的电子设备。在这里，我们实施了特斯拉阀的类似物。它表现出非肾脏转运，可以被视为电子粘性二极管。在载体密度和与流体动力学状态一致的载体密度和温度下发生纠正，并在弹道和扩散的运输方式中消失。在将电子暴露于Moiré超晶格的设备中，在整流行为中观察到越过Van Hove奇异性时的Lifshitz过渡。
Systems in which interparticle interactions prevail can be described by hydrodynamics. This regime is typically difficult to access in the solid state for electrons. However, the high purity of encapsulated graphene combined with its advantageous phonon properties make it possible, and hydrodynamic corrections to the conductivity of graphene have been observed. Examples include electron whirlpools, enhanced flow through constrictions as well as a Poiseuille flow profile. An electronic device relying specifically on viscous behaviour and acting as a viscometer has however been lacking. Here, we implement the analogue of the Tesla valve. It exhibits nonreciprocal transport and can be regarded as an electronic viscous diode. Rectification occurs at carrier densities and temperatures consistent with the hydrodynamic regime, and disappears both in the ballistic and diffusive transport regimes. In a device in which the electrons are exposed to a Moiré superlattice, the Lifshitz transition when crossing the Van Hove singularity is observed in the rectifying behaviour.
