Topological light for the control of skyrmionic textures and spin waves

Topological light is the laser whose wave front has a geometric singularity, and a typical one is the vortex beam carrying orbital angular momentum. Its several applications have been intensively studied in optics, while its potential have not been explored well in condensed-matter physics. Very recently, such structural lights have been gradually applied to find new photo-induced phenomena in solids. In the last few years, we have theoretically proposed ways of controlling magnetism with topological light [1-4]. Among them, I would like to report two proposals: a systematic way of creating ring-type spin textures such as skyrmioniums by applying high-frequency vortex beams to chiral magnets [1], and spin-wave resonance driven by terahertz vortex beams in ordered magnets [2]. These offer ways of printing the information about the beam onto magnets. [1] Fujita and MS, PRB95, 054421 (2017). [2] Fujita, and MS, PRB96, 060407(R) (2017). [3] Fujita and MS, Sci. Rep. 8, 15738 (2018). [4] Fujita, Tada, and MS, New. J. Phys. 21, 073010 (2019).