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Topological semimetals are predicted to exhibit unconventionalelectrodynamics, but a central experimental challenge is singling out thecontributions from the topological bands. TaAs is the prototypical example,where 24 Weyl points and 8 trivial Fermi surfaces make the interpretation ofany experiment in terms of band topology ambiguous. We report magneto-infraredreflection spectroscopy measurements on TaAs. We observed sharp inter-Landaulevel transitions from a single pocket of Weyl Fermions in magnetic fields aslow as 0.4 tesla. We determine the W2 Weyl point to be 8.3 meV below the Fermienergy, corresponding to a quantum limit - the field required to reach thelowest LL - of 0.8 Tesla - unprecedentedly low for Weyl Fermions. LLspectroscopy allows us to isolate these Weyl Fermions from all other carriersin TaAs and our result provides a new way for directly exploring the moreexotic quantum phenomena in Weyl semimetals, such as the chiral anomaly.

Weyl Fermion Magneto-Electrodynamics and Ultra-low Field Quantum Limit in TaAs