论文标题
aharonov bohm在石墨烯fabrypérot量子厅干涉仪中
Aharonov Bohm Effect in Graphene Fabry Pérot Quantum Hall Interferometers
论文作者
论文摘要
量子干涉仪是探测不可区分颗粒的波浪状和交换统计量的强大工具。特别感兴趣的是由手性，一维（1D）边缘通道（QHE）引导电子而没有消散的电子的干涉仪。使用量子点触点（QPC）作为梁拼图器，可以将这些1D通道分开并重新组合，从而使带电颗粒的干扰。这种量子霍尔干涉仪（QHI）可用于研究任何循环粒子的交换统计。在这项研究中，我们在范德华（VDW）材料中开发了强大的QHI制造技术，并实现了基于石墨烯的Fabry-Pérot（FP）QHI。通过仔细的异质结构设计，我们能够在整数QHE中测量纯Aharonov-Bohm（AB）干扰效应，这是有限尺寸FP干涉仪的主要技术挑战。我们发现，由于速度相对较大和长相干长度，整数边缘模式显示出很高的可见性干扰。我们使用可调QPC的QHI为VDW材料中的干涉仪研究提供了一个多功能平台，并在分数QHE中实现了未来的实验。
Quantum interferometers are powerful tools for probing the wave-nature and exchange statistics of indistinguishable particles. Of particular interest are interferometers formed by the chiral, one-dimensional (1D) edge channels of the quantum Hall effect (QHE) that guide electrons without dissipation. Using quantum point contacts (QPCs) as beamsplitters, these 1D channels can be split and recombined, enabling interference of charged particles. Such quantum Hall interferometers (QHIs) can be used for studying exchange statistics of anyonic quasiparticles. In this study we develop a robust QHI fabrication technique in van der Waals (vdW) materials and realize a graphene-based Fabry-Pérot (FP) QHI. By careful heterostructure design, we are able to measure pure Aharonov-Bohm (AB) interference effect in the integer QHE, a major technical challenge in finite size FP interferometers. We find that integer edge modes exhibit high visibility interference due to relatively large velocities and long phase coherence lengths. Our QHI with tunable QPCs presents a versatile platform for interferometer studies in vdW materials and enables future experiments in the fractional QHE.
