Dynamical chiral magnetic current and instability in Weyl semimetals

In massless fermionic systems such as Weyl semimetals, it is known that electric currents are induced by magnetic fields, which is called the chiral magnetic effect [1]. In this talk, we will present our recent study that analyzes the chiral magnetic effect driven by a dynamical magnetic field in Weyl semimetals [2]. In particular, their electromagnetic linear responses are investigated based on the effective field theory and on the chiral kinetic theory. Furthermore, we incorporate dissipation in the relaxation-time approximation and study collective excitations coupled with Maxwell electromagnetic fields.

[1] K. Fukushima, D. E. Kharzeev, and H. J. Warringa, Phys. Rev. D 78, 074033 (2008).

[2] T. Amitani and Y. Nishida, arXiv:2207.14272