2025/08/18 by Kirill Tuchin, Tuchin, Kirill · 1 citation
Engineering · Physics and Astronomy · #Crystallography and Radiation Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Materials Science (cond-mat.mtrl-sci) #Nuclear Theory (nucl-th) #Optical and Acousto-Optic Technologies #Terahertz technology and applications
paper · pdf · doi:10.48550/arxiv.2508.12923
openalex publication_date 2025/08/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate photon production from media characterized by a time-dependent chiral chemical potential μ5(t). We first consider the chiral anomaly as a small perturbation and show that μ5→ 2γ process generates non-polarized radiation, as the probabilities of producing right and left-handed photons are equal. In chiral semimetal with a vanishing chiral chemical potential but a finite separation of Weyl nodes, \bf Δ(t), the photon production vanishes at the leading order of perturbation theory. We then employ the method of Bogolyubov transformation to obtain the photon spectrum that sums up all powers of μ5. Employing the exactly solvable model μ5(t) ∝ A+B\tanh(t/τ), we demonstrate that the spectrum exhibits strong circular polarization, whose direction is determined by the sign of μ5. The spectrum contains resonances associated with the instability of the electromagnetic field in chiral media. We discuss potential phenomenological applications of these findings.