流体动力学反点石墨烯超晶格中的超弹道传导
Superballistic conduction in hydrodynamic antidot graphene superlattices
AI总结：
本研究构建了三种不同孔径的反点石墨烯超晶格，通过测量其在不同温度和垂直磁场下的电学性质，发现超弹道效应增强且随磁场非单调变化，并分析了器件电阻的标度律，证明该结构是实现流体动力学流动的便捷几何结构。
摘要：
黏性电子流表现出诸如超弹道传导等奇特的特性。为了观察流体动力学效应，需要一种电流分布尽可能不均匀的二维器件。为此，我们构建了三种具有不同孔径的反点石墨烯超晶格。我们在不同温度及垂直磁场作用下测量了它们的电学性质。我们发现超弹道效应得到增强，表明该几何结构在使电子流偏转方面是有效的。此外，与从非集体到集体输运状态的转变相关的超弹道传导，其随磁场表现出非单调行为。我们还分析了器件电阻作为反点超晶格尺寸的函数，以找到描述不同输运状态的特征标度律。我们证明了反点超晶格是实现流体动力学流动的便捷几何结构，并为超弹道传导和标度律这些技术相关效应提供了有价值的解释。
英文摘要：
Viscous electron flow exhibits exotic signatures such as superballistic conduction. In order to observe hydrodynamics effects, a 2D device where the current flow is as inhomogeneous as possible is desirable. To this end, we build three antidot graphene superlattices with different hole diameters. We measure their electrical properties at various temperatures and under the effect of a perpendicular magnetic field. We find an enhanced superballistic effect, suggesting the effectiveness of the geometry at bending the electron flow. In addition, superballistic conduction, which is related to a transition from a non-collective to a collective regime of transport, behaves non-monotonically with the magnetic field. We also analyze the device resistance as a function of the size of the antidot superlattice to find characteristic scaling laws describing the different transport regimes. We prove that the antidot superlattice is a convenient geometry for realizing hydrodynamic flow and provide valuable explanations for the technologically relevant effects of superballistic conduction and scaling laws.
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