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Chiral light amplifier with pumped Weyl semimetals

Yusuke Nishida
Dec 2022
摘要
Parallel electric and magnetic fields applied to Weyl semimetals pump axialcharge via the axial anomaly until balanced by intervalley relaxation. Theresulting nonequilibrium steady state exhibits the chiral magnetic effect aswell as the anomalous Hall effect, which coupled with Maxwell's equations leadsto unstable electromagnetic waves at low frequency and long wavelength. Here,we show that such chiral magnetic instability manifests itself as anomalousreflectance of the surface of pumped Weyl semimetal. Depending on electric,chiral magnetic, and anomalous Hall conductivities, the reflectance is found toexceed unity in a finite range of frequency for a circularly polarized lightincident along the direction of Weyl node separation.
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