extrema between the two nodes. Such a feature has been experimentally observed in the inversion symmetry broken WSM TaAs [@xu2016optical].

In this paper, we report the complex optical conductivity of YbMnBi$_2$ obtained from Kramers-Kronig (KK) constrained variational dielectric function (VDF) fitting of the reflectivity [@chaudhuri2016optical]. A comparison of the experimental optical spectra with that calculated from the DFT band structure shows that the low energy features in the spectrum can be attributed to specific inter-band transitions and are not a signature of the van Hove singularity as proposed elsewehere [@chinotti2016electrodynamic]. The optical spectra has also been compared to the calculated band structures with both canted and uncanted AFM ordering which opens the possibility of reconciling the ARPES experiments with the neutron scattering and transport results. We believe our optical data is explained qualitatively by the uncanted magnetic structure with a small offset of the chemical potential from strict stochiometry.

Experimental and Computational Details
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![\[fig:ref\] (a) Reflectivity of YbMnBi$_2$ measured using FTIR spectroscopy. (b) Raw reflectivity data at 300 K along with reflectivity curve as obtained from VDF fitting. (c) Resistivity of the sample measured using a 4-probe technique along with the Drude scattering rates.](ref_fitting_log.png "fig:"){width="48.00000%"}\

![\[fig:ref\] (a) Reflectivity 