Gate-Controlled Transmission of Quantum Hall Edge States in Bilayer Graphene
Gate-Controlled Transmission of Quantum Hall Edge States in Bilayer Graphene
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DOI：
10.1103/physrevlett.120.057701
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发表时间：
2018-01-31
影响因子：
8.6
通讯作者：
Zhu, Jun
中科院分区：
文献类型：
--
作者：
Li, Jing;Wen, Hua;Zhu, Jun
二维电子气的量子霍尔和分数量子霍尔效应的边缘态携带着体激发的关键信息。在这里，我们展示了栅极控制传输的边缘状态在双层石墨烯通过势垒与可调的高度。后向散射率从0到接近1连续变化，分数量化值对应于各个模式的顺序完整后向散射。我们的实验证明了可控操纵双层石墨烯边缘态的可行性，从而为更复杂的实验打开了大门。
The edge states of the quantum Hall and fractional quantum Hall effect of a two-dimensional electron gas carry key information of the bulk excitations. Here we demonstrate gate-controlled transmission of edge states in bilayer graphene through a potential barrier with tunable height. The backscattering rate is continuously varied from 0 to close to 1, with fractional quantized values corresponding to the sequential complete backscattering of individual modes. Our experiments demonstrate the feasibility to controllably manipulate edge states in bilayer graphene, thus opening the door to more complex experiments.