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We use time-domain terahertz spectroscopy to measure the low energyconductivity and magnons in RuCl$_3$ under external magnetic field. At zerofield, an oscillation with a frequency of 0.62 THz is clearly observed intime-domain spectrum below T$_N$, which is identified as a magnon excitation inthe magnetic order state. The magnon excitation is not affected by the externalmagnetic field $\textbf{H}_{DC}$ when it is applied along the c-axis, but isclearly suppressed when $\textbf{H}_{DC}$ is applied within ab plane. Moreinterestingly, when the magnetic component of THz wave $\textbf{h}(t)$ isperpendicular to the applied in-plane magnetic field, we observe anothercoherent oscillation at slightly higher energy scale at the field above 2 T,which is eventually suppressed for $H_{DC}>$5 T. The measurement seems toindicate that the in-plane magnetic field can lift the degeneracy of twobranches of low energy magnons at $\Gamma$ point. The low energy opticalconductivity calculated from the measured transmission spectrum is dominated bya broad continuum contribution, which is not affected by changing eithertemperature or external magnetic field. The continuum is likely to be relatedto the fractional spin excitation due to dominated Kitaev interaction in thematerial.

Field induced magnon excitation and in gap absorption of Kitaev candidate RuCl3