利用边缘磁等离子体的紧凑自匹配旋磁器
Compact self-matched gyrators using edge magnetoplasmons
AI总结：
本文提出利用边缘磁等离子体实现紧凑非互易器件，通过设计三端电容几何结构，实现自匹配旋磁器，具有低损耗和高性能。
摘要：
边缘磁等离子体提供了一种自然的非对称电动力学平台，其中打破时间反演对称性迫使单向传播。在微波频率下探测时，它们提供了一种实现紧凑非互易器件的途径。迄今为止，实现过程中遇到了较大的损耗或需要复杂的匹配网络。本文展示，通过与电容门耦合的环形模式产生旋磁响应，其特征是正反向传输之间有π相位差。通过设计三端电容几何结构，实现了自阻抗匹配的旋磁器，其中旋磁点与传输最大值重合，从而在不使用外部匹配网络的情况下实现几乎无损耗的旋磁。本文器件在GaAs二维电子气上实现，工作频率为0.2至2 GHz，通过磁场调节，具有亚毫米级的尺寸和插入损耗低至2 dB。这比商业和等离子体单元分别小100倍且更少损耗。一个耗散模型与实验一致，提供了基本物理和关键材料参数，为更少损耗的器件铺平道路，通过材料改进接近理想操作。自阻抗匹配的概念广泛适用于各种器件，从而为新一代高质量微波等离子体技术奠定了基础。
英文摘要：
Edge magnetoplasmons provide a natural platform for chiral electrodynamics, where broken time-reversal symmetry enforces unidirectional propagation. When probed at microwave frequencies, they offer a route to compact non-reciprocal devices. So far, implementations have suffered from large losses or required complicated matching networks. Here we show that the circulating modes coupled to capacitive gates give rise to a gyrator response, characterized by directional π phase difference between forward and reverse transmission. By engineering a three-terminal capacitive geometry, we realize a self-impedance matched gyrator in which the gyration points coincide with transmission maxima, enabling nearly lossless gyration without external matching networks. Our devices are implemented on a GaAs 2D gas, operate from 0.2 to 2 GHz, tuned by magnetic field, with sub-millimeter footprints and insertion loss as low as 2 dB. This is a factor of 100 smaller and less lossy than commercial and plasmon units, respectively. A dissipative model, in agreement with experiment, provides the fundamental physics and delivers the key materials parameters, leading the way to even less lossy devices approaching ideal operation by materials improvement. The self-impedance matched concept is broadly applicable to a variety of devices, thus providing a foundation for a new generation of high-quality microwave plasmon technology.
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