Optical evidence of the chiral magnetic anomaly in Weyl semimetal TaAs

Abstract

Chiral pumping from optical electric fields oscillating at THz frequencies is observed in the Weyl material TaAs with electric and magnetic fields aligned along both the a- and c-axes. Free carrier spectral weight enhancement is measured directly for the first time, confirming theoretical expectations of chiral pumping. A departure from linear field-dependence of the Drude weight is observed at the highest fields in the quantum limit, providing direct evidence of field-dependent Fermi velocity of the chiral Landau level. Implications for the chiral magnetic effect in Weyl semimetals from the optical f-sum rule are discussed.

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Cited by in corpus (15)

• The sign of longitudinal magnetoconductivity and the planar Hall effect in Weyl semimetals
• Probing charge pumping and relaxation of the chiral anomaly in a Dirac semimetal
• Nodal Semimetals: A Survey on Optical Conductivity
• Longitudinal magnetoconductance and the planar Hall effect in a lattice model of tilted Weyl fermions
• Optical Control of Chiral Charge Pumping in a Topological Weyl Semimetal
• Revisiting magnetotransport in Weyl semimetals
• Magneto-optical Kerr effect and signature of the chiral anomaly in a Weyl semimetal in a magnetic field
• Magneto-optical Kerr effect in Weyl semimetals with broken inversion and time-reversal symmetries
• Landau quantization in tilted Weyl semimetals with broken symmetry
• Magneto-optical response of the Weyl semimetal NbAs: Experimental results and hyperbolic-band computations
• Electric and chiral response to a pseudoelectric field in Weyl materials
• Quantum magnetic oscillations in Weyl semimetals with tilted nodes
• Impurities in 3D quadratic band-touching Luttinger semimetals : Friedel and RKKY oscillations
• Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher-Fold Weyl Fermionic System PtAl
• Van Roosbroeck's equations with topological terms: the case of Weyl semimetals