Observation of a two-dimensional Fermi surface and Dirac dispersion in YbMnSb2

We present the crystal structure, electronic structure, and transport properties of the material ${\mathrm{YbMnSb}}_{2}$, a candidate system for the investigation of Dirac physics in the presence of magnetic order. Our measurements reveal that this system is a low-carrier-density semimetal with a two-dimensional Fermi surface arising from a Dirac dispersion, consistent with the predictions of density-functional-theory calculations of the antiferromagnetic system. The low temperature resistivity is very large, suggesting that scattering in this system is highly efficient at dissipating momentum despite its Dirac-like nature.

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