Chiral light amplifier with pumped Weyl semimetals

Abstract

Parallel electric and magnetic fields applied to Weyl semimetals pump axial charge via the axial anomaly until balanced by intervalley relaxation. The resulting nonequilibrium steady state exhibits the chiral magnetic effect as well as the anomalous Hall effect, which coupled with Maxwell's equations leads to unstable electromagnetic waves at low frequency and long wavelength. Here, we show that such chiral magnetic instability manifests itself as anomalous reflectance of the surface of pumped Weyl semimetal. Depending on electric, chiral magnetic, and anomalous Hall conductivities, the reflectance is found to exceed unity in a finite range of frequency for a circularly polarized light incident along the direction of Weyl node separation.

5 pages, 3 figures; published version

References in corpus (8)

• The Chiral Magnetic Effect
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• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Strain induced Chiral Magnetic Effect in Weyl semimetals
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• Anomaly-driven inverse cascade and inhomogeneities in a magnetized chiral plasma in the early Universe
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Cited by in corpus (5)

• Observation of a dynamic magneto-chiral instability in photoexcited tellurium
• Optical reflection signature of an axion dielectric with magnetic current
• Nanoscale Casimir Force Softening Originated from Quantum Surface Responses
• Double rotatory power reversal, continuous Kerr angle, and enhanced reflectance in bi-isotropic media with anomalous Hall current
• Effect of trivial bands on chiral anomaly-induced longitudinal magnetoconductivity in Weyl semimetals