Fu Hailong, Huang Ke, Watanabe Kenji, Taniguchi Takashi, Zhu Jun
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
School of Physics, Zhejiang University, Hangzhou 310058, China.
Nano Lett. 2023 Nov 8;23(21):9726-9732. doi: 10.1021/acs.nanolett.3c02253. Epub 2023 Oct 20.
Quantum confinement structures are building blocks of quantum devices in fundamental physics exploration and technological applications. In this work, we fabricate dual-gated bilayer graphene Fabry-Pérot quantum Hall interferometers employing two different gating strategies and conduct finite element simulations to understand the electrostatics of the confinement structures and to guide device design and fabrication. We observe two types of resistance oscillations arising from the charging of quantum dots formed inside the interferometers. We obtain the size, location, and charging energy of the dots by measuring the dependence of the oscillations on the magnetic field, gate voltages, and dc bias. We analyze and discuss the origin of the quantum dots and their impact on quantum Hall edge state backscattering and interference. Insights gained in these studies shed light on the construction of van der Waals quantum confinement devices.
量子限制结构是基础物理探索和技术应用中量子器件的构建单元。在这项工作中，我们采用两种不同的门控策略制造了双栅双层石墨烯法布里 - 珀罗量子霍尔干涉仪，并进行了有限元模拟，以了解限制结构的静电学特性，并指导器件的设计与制造。我们观察到干涉仪内部形成的量子点充电产生的两种电阻振荡类型。通过测量振荡对磁场、栅极电压和直流偏置的依赖性，我们获得了量子点的尺寸、位置和充电能量。我们分析并讨论了量子点的起源及其对量子霍尔边缘态背散射和干涉的影响。这些研究中获得的见解为范德华量子限制器件的构建提供了启示。
