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Dirac semi-metal with magnetic atoms as constituents delivers an interestingplatform to investigate the interplay of Fermi surface (FS) topology, electroncorrelation, and magnetism. One such family of semi-metal is YbMn$Pn_2$ ($Pn$ =Sb, Bi), which is being actively studied due to the intertwined spin and chargedegrees of freedom. In this Letter, we investigate the relationship between themagnetic/crystal structures and FS topology of YbMnSb$_2$ using single crystalx-ray diffraction, neutron scattering, magnetic susceptibility,magnetotransport measurement and complimentary DFT calculation. Contrary toprevious reports, the x-ray and neutron diffraction reveal that YbMnSb$_2$crystallizes in an orthorhombic $Pnma$ structure with notable anti-phasedisplacement of the magnetic Mn ions that increases in magnitude upon cooling.First principles DFT calculation reveals a reduced Brillouin zone and moreanisotropic FS of YbMnSb$_2$ compared to YbMnBi$_2$ as a result of theorthorhombicity. Moreover, the hole type carrier density drops by two orders ofmagnitude as YbMnSb$_2$ orders antiferromagnetically indicating band folding inmagnetic ordered state. In addition, the Landau level fan diagram yields anon-trivial nature of the SdH quantum oscillation frequency arising from theDirac-like Fermi pocket. These results imply that YbMnSb$_2$ is an idealplatform to explore the interplay of subtle lattice distortion, magnetic order,and topological transport arising from relativistic quasiparticles.

Fermi surface reconstruction due to the orthorhombic distortion in Dirac semimetal YbMnSb$_2$