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The antiferromagnetic kagome lattice compound FeGe has been revealed to hostan emergent charge-density-wave (CDW) state which manifests complex interplaybetween the spin, charge and lattice degrees of freedom. Here, we present acomprehensive study of the de Haas-van Alphen effect by measuring torquemagnetometry under magnetic fields up to 45.2 T to map Fermi surfaces in thisunusual CDW state. For field along the $c$ direction, we resolve four cyclotronorbits; the largest one roughly corresponding to the area of the 2$\times$2folded Brillouin zone. Three smaller orbits are characterized by lighteffective cyclotron masses range from (0.18-0.30) $m_e$. Angle-resolvedmeasurements identify one Fermi surface segment with weak anisotropy. Combinedwith band structure calculations, our results suggest that features of unfoldedFermi surfaces are robust against CDW reconstruction, corroborating the noveleffect of a short-ranged CDW on the electronic structure.

Evidence for Unfolded Fermi Surfaces in the Charge-Density-Wave State of Kagome Metal FeGe Revealed by de Haas-van Alphen Effect