论文标题
基于石墨烯的量子厅干涉仪与自对准的侧门
Graphene-based quantum Hall interferometer with self-aligned side gates
论文作者
论文摘要
石墨烯的消失带隙长期以来提出了建立高质量量子点接触（QPC）的挑战 - 常规分裂门引入的部分透明的P-N接口往往会缩短QPC。这种并发症阻碍了石墨烯量子厅Fabry-Pérot干涉仪的制造，直到最近的进步允许拆分门QPC使用高电阻性$ν= 0 $状态进行操作。在这里，我们提出了一个简单的配方，通过在石墨烯片中蚀刻狭窄的沟渠来制造QPC，以将导电通道与自对齐的石墨烯侧门分开。我们证明了单个QPC在量子厅制度中的操作，并进一步利用这些QPC来创建和研究量子厅干涉仪。
The vanishing band gap of graphene has long presented challenges for making high-quality quantum point contacts (QPCs) -- the partially transparent p-n interfaces introduced by conventional split-gates tend to short the QPC. This complication has hindered the fabrication of graphene quantum Hall Fabry-Pérot interferometers, until recent advances have allowed split-gate QPCs to operate utilizing the highly resistive $ν=0$ state. Here, we present a simple recipe to fabricate QPCs by etching a narrow trench in the graphene sheet to separate the conducting channel from self-aligned graphene side gates. We demonstrate operation of the individual QPCs in the quantum Hall regime, and further utilize these QPCs to create and study a quantum Hall interferometer.
