拓扑保护的边缘磁等离子体激元与体磁等离子体激元在无专用腔体下的超强耦合
Ultrastrong coupling of topologically protected edge and bulk magnetoplasmons without a dedicated cavity
- TU Dortmund University（多特蒙德工业大学）
- Warsaw University of Technology（华沙理工大学）
- Institute of High Pressure Physics PAS（波兰科学院高压物理研究所）
- University Duisburg-Essen（杜伊斯堡-埃森大学）
- LNCMI, CNRS-UGA-UPS-INSA-EMFL（法国国家强磁场实验室）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
该研究在无专用腔体下，利用受限电子介质的空间对称性，通过图案化量子阱实现拓扑保护边缘与体磁等离子体激元间的超强耦合，耦合强度达0.1，为超强光-物质相互作用开辟新参数空间。
中文摘要 AI 辅助
在超强光-物质耦合体系中，将电场限制在亚波长尺度并定义电磁模式的能力至关重要。这一任务通常通过专用腔体（如太赫兹金属谐振器）实现。在此，我们转而直接在不同的磁等离子体激元激发之间引入超强耦合，仅利用在磁场作用下受限电子介质的空间对称性。通过将承载二维电子气的AlGaN/GaN单量子阱图案化为微米级贴片，我们调控了拓扑保护的边缘磁等离子体激元与体磁等离子体激元之间的相互作用，实现了高达0.1的耦合强度。旋转对称性的逐步破缺决定了耦合规则，并导致能隙的出现和独特的手性模式杂化。我们的结果凸显了一条利用磁等离子体激元波函数的对称性类别和拓扑性作为无专用腔体下超强光-物质相互作用的新参数空间的路径。
英文摘要
In the ultrastrong light-matter coupling regime, the ability to confine the electric field to subwavelength scales and define an electromagnetic mode is essential. This task is typically achieved through dedicated cavities, such as THz metal resonators. Here, we instead introduce ultrastrong coupling directly between distinct magnetoplasmon excitations, leveraging solely the spatial symmetry of a confined electronic medium in the presence of a magnetic field. By patterning an AlGaN/GaN single quantum well hosting a two-dimensional electron gas into micrometer-scale patches, we tailor the mutual interactions between topologically protected edge and bulk magnetoplasmons, achieving coupling strengths of up to 0.1. The progressive breaking of rotational symmetry determines the coupling rules and leads to the emergence of energy gaps and unique chiral-mode hybridization. Our results highlight a path towards exploiting the symmetry class and topology of the magnetoplasmon wavefunction as a new parameter space for ultrastrong light-matter interaction without a dedicated cavity.
