论文标题
双层石墨烯中的门定义通道后面的相干喷射
Coherent Jetting behind a gate-defined Channel in Bilayer Graphene
论文作者
论文摘要
石墨烯已进化为可以与最佳和最清洁的半导体系统竞争的量子传输平台。最近，通过各种扫描探针技术研究了石墨烯中载体运输的许多有趣的局部特性。在这里，我们报告了观察到从双层石墨烯中狭窄的分裂门定义的通道发出的不同电子喷气机的观察。我们发现，这些通过其干扰模式可见的喷气机主要出现，彼此之间的角度为60°。该观察结果与双层石墨烯的特定带结构有关，尤其是三角形翘曲，这导致了低能传导通道的山谷依赖性矩形选择。对电子喷射的实验观察结果对石墨烯的载体运输以及依赖弹道和山谷选择性传输的设备具有后果。
Graphene has evolved as a platform for quantum transport that can compete with the best and cleanest semiconductor systems. Recently, many interesting local properties of carrier transport in graphene have been investigated by various scanning probe techniques. Here, we report on the observation of distinct electronic jets emanating from a narrow split-gate defined channel in bilayer graphene. We find that these jets, which are visible via their interference patterns, occur predominantly with an angle of 60° between each other. This observation is related to the specific bandstructure of bilayer graphene, in particular trigonal warping, which leads to a valley-dependent selection of momenta for low-energy conduction channels. This experimental observation of electron jetting has consequences for carrier transport in graphene in general as well as for devices relying on ballistic and valley selective transport.
