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To investigate the electronic structure of Weyl semimetals Ta$Pn$ ($Pn=$P,As), optical conductivity [$\sigma(\omega)$] spectra are measured over a widerange of photon energies and temperatures, and these measured values arecompared with band calculations. Two significant structures can be observed: abending structure at $\hbar\omega\sim$85 meV in TaAs, and peaks at$\hbar\omega\sim$ 50 meV (TaP) and $\sim$30 meV (TaAs). The bending structurecan be explained by the interband transition between saddle points connecting aset of $W_2$ Weyl points. The temperature dependence of the peak intensity canbe fitted by assuming the interband transition between saddle points connectinga set of $W_1$ Weyl points. Owing to the different temperature dependence ofthe Drude weight in both materials, it is found that the Weyl points of TaAsare located near the Fermi level, whereas those of TaP are further away.

Optical signature of Weyl electronic structures in tantalum pnictides Ta$Pn$ ($Pn=$ P, As)