We recently witnessed the discovery of various chiral interactions between magnetic, phononic, electronic, and photonic excitations in spintronics that mediate the excitation of quasiparticles into a single direction, leading to phenomena such as chiral spin and phonon pumping, chiral spin Seebeck, magnonic skin, magnon trap, magnon Doppler, and spin diode effects [1-6]. Intriguing analogies with electric counterparts in the nano-optics and plasmonics exists. In this talk, I will present a unified electrodynamic picture for dynamical chirality in spintronics and compare it with that in nano-optics and plasmonics [1]. Based on the general theory, I subsequently review the theoretical progress and experimental evidence of chiral interaction between various excitations in magnetic, photonic, electronic, and phononic nanostructures at GHz time scales.

[1] T. Yu*, G. E. W. Bauer, and Z. C. Luo, "Chiral Excitations in Spintronics", review article for Physics Reports.
[2] T. Yu, Y. M. Blanter, and G. E. W. Bauer, “Chiral pumping of spin waves ”, Phys. Rev. Lett. 123, 247202 (2019).
[3] T. Yu, Y.-X. Zhang, S. Sharma, X. Zhang, Y. M. Blanter, and G. E. W. Bauer, “ Magnon Accumulation in Chirally Coupled Magnets”, Phys. Rev. Lett. 124, 107202 (2020).
[4] X. Zhang, G. E. W. Bauer, and T. Yu*, “ Unidirectional Pumping of Phonons by Magnetization Dynamics”, Phys. Rev. Lett 125, 077203 (2020).
[5] T. Yu and G. E. W. Bauer, “Noncontact Spin Pumping by Microwave Evanescent Fields ”, Phys. Rev. Lett 124, 236801 (2020).
[6] T. Yu, C. Wang, M. Sentef, and G. E. W. Bauer, “Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators”, Phys. Rev. Lett. 126, 137202 (2021).