Topological Langmuir-Cyclotron Wave

In the past decade, topological phases of electronic and photonic systems have become a rapidly emerging field of research, which deepened understanding of the state of matters. Topological Langmuir-Cyclotron Wave (TLCW) is a recently identified topological surface excitation in magnetized plasmas. We show that TLCW is mathematically a spectral flow of a Hamiltonian pseudo-differential operator and originates from the nontrivial topology at the Langmuir wave-cyclotron wave resonance. By isofrequency surface analysis and time-dependent simulations, we demonstrate that the TLCW can propagate robustly along the complex transition interfaces unidirectionally and without scattering. Because of these desirable features, the TLCW could be explored as an effective mechanism to drive current and flow in magnetized plasmas. The analysis also establishes a close connection between plasmas' newly instituted topological phase classification and the classical CMA diagram of plasma waves.





References:



[1] Fu, Y., & Qin, H. (2021). Topological phases and bulk-edge correspondence of magnetized cold plasmas. Nature Communications, 12(1), 1-8.



[2] Fu, Y., & Qin, H. (2022). The dispersion and propagation of topological Langmuir-cyclotron waves in cold magnetized plasmas. arXiv preprint arXiv:2203.01915.



[3] Qin, H., & Fu, Y. (2022). Topological Langmuir-cyclotron wave. arXiv preprint arXiv:2205.02381.