Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates
Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates
复制标题
具有自对准侧门的基于石墨烯的量子霍尔干涉仪
DOI：
10.1021/acs.nanolett.2c03805
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Finkelstein, Gleb
中科院分区：
文献类型：
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作者：
Zhao, Lingfei;Arnault, Ethan G.;Larson, Trevyn F.;Iftikhar, Zubair;Seredinski, Andrew;Fleming, Tate;Watanabe, Kenji;Taniguchi, Takashi;Amet, François;Finkelstein, Gleb
石墨烯消失的带隙长期以来一直是制造高质量量子点接触（QPC）的挑战-传统分裂门引入的部分透明p-n界面往往会使QPC短路。这种复杂性阻碍了石墨烯量子霍尔法布里-珀罗干涉仪的制造，直到最近的进展允许分裂门量子光子晶体利用高电阻ν = 0状态进行操作。在这里，我们提出了一个简单的配方，通过在石墨烯片上蚀刻一个狭窄的沟槽，将导电沟道与自对准的石墨烯侧栅分开，来制造QPC。我们展示了在量子霍尔制度的个人QPC的操作，并进一步利用这些QPC创建和研究量子霍尔干涉仪。
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 circuit the QPCs. 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.