论文标题
磁化等离子体边界处的非平凡低频拓扑波
Nontrivial low-frequency topological waves at the boundary of a magnetized plasma
论文作者
论文摘要
最近探索了磁化冷气体血浆的拓扑特性，并建立了受拓扑保护的边缘状态的存在。这些研究仅限于磁化等离子体，该等离子体无限地庞大，并提供中和背景。当包括离子运动时，分散关系中会出现新的一类新的低频单向拓扑波（TSPW）。这些波的组速度与给定磁场方向相反的高频拓扑电子波的相反方向。计算浆果曲率和Chern数字以建立非平凡的拓扑阶段。此外，我们在离子回旋频率上方传播离子主导的TSPW的独特特征：它们通过耦合与低杂交共振模式的连续体进行的无碰撞阻尼定位在光滑的等离子体 - vacuum界面内。这些发现扩大了这些异国情调激发在太空和实验室等离子体中的可能应用和观察。
The topological properties of a magnetized cold gaseous plasma have recently been explored and the existence of topologically protected edge states has been established. These studies are limited to a magnetized plasma, where ions are infinitely massive and provide a neutralizing background. When ion motion is included, a new class of low-frequency unidirectional topological waves (TSPWs) emerges in the dispersion relation. The group velocity of these waves is in the opposite direction of high-frequency topological electron waves for a given magnetic field direction. The Berry curvature and Chern numbers are calculated to establish nontrivial topological phase. Additionally, we demonstrate a unique characteristic of ion dominated TSPW propagating above the ion cyclotron frequency: their collisionless damping via coupling to the continuum of lower-hybrid resonant modes localized inside a smooth plasma-vacuum interface. These finding broadens the possible applications and observations of these exotic excitations in space and laboratory plasmas.
