论文标题
INAS/INGASB复合量子井中双极边缘磁性传输的时间分辨测量
Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
论文作者
论文摘要
一维边缘状态的时间分辨电荷传输测量是研究非平衡电荷动力学和基本相互作用效应的强大手段。在这里，我们报告了一种多功能的片上时间分辨的运输测量方案，该方案不需要量子点接触，因此适用于窄间隙系统。我们将该技术应用于非转向INAS/in $ _ {x} $ ga $ _ {1-x} $ SB复合量子井，其双层性角色使我们能够使用单个设备在电子和孔方案中分别演示该方案。量子大厅机制中的时间分辨测量清楚地表现出每个载体的手性，脉冲电荷波形仅在电子和孔相反的一个磁场方向上观察到。时间结构域中的波形分析显示，电子和孔状态中边缘磁脉冲脉冲的较低和拓宽了边缘磁极脉冲，这表明块状水坑在整体中产生了影响。我们适用于各种系统的时间分辨测量方案将为研究外来拓扑边缘状态的动力学特性铺平道路。
Time-resolved charge transport measurement for one-dimensional edge states is a powerful means for investigating nonequilibrium charge dynamics and underlying interaction effects therein. Here, we report a versatile on-chip time-resolved transport measurement scheme that does not require a quantum point contact and is therefore applicable to narrow-gap systems. We apply the technique to non-inverted InAs/In$_{x}$Ga$_{1-x}$Sb composite quantum wells, where its ambipolar character enables us to demonstrate the scheme in both the electron and hole regimes separately using a single device. Time-resolved measurements in the quantum Hall regimes clearly exhibit the chirality of each carrier, with pulsed charge waveforms observed only for one magnetic field direction opposite for electrons and holes. Waveform analysis in the time domain reveals reduced group velocity and broadening of edge magnetoplasmon pulses in both the electron and hole regimes, suggesting the influence of charge puddles in the bulk. Our time-resolved measurement scheme, applicable to various systems, will pave the way for investigations of dynamical properties of exotic topological edge states.
