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The shape of the Fermi surface, the effective mass of carriers, and thetopologically non-trivial nature of electronic bands of kagome magnet GdV6Sn6are investigated using de Haas van Alphen (dHvA) oscillations measurements. Ourtemperature and angle dependent torque magnetometry measurements reveal atleast seven different frequencies ranging from ~90 T up to ~9000 T. Thesefrequencies correspond to extremal areas of Fermi surface ranging from ~1% upto 50% of the first Brillouin zone, qualitatively consistent with electronicstructure calculations. The angle dependent dHvA oscillations frequenciesindicate that all pockets of Fermi surface are mostly two-dimensional. We alsofind evidence of the presence of lighter (0.58 m0) as well as heavier (2.25 m0)electrons through the analysis of the temperature dependence of dominantfrequencies, reflecting the features of correlated and Dirac like dispersionsin the electronic structure. The estimation of the Berry phase indicates thetopologically non-trivial nature of the lowest frequency band containinglighter electrons. This is consistent with the presence of Dirac-like lineardispersion in the electronic structure.

Evidence of quasi-2D Fermi surface and non-trivial electronic topology in kagome lattice magnet GdV6Sn6 using de Haas van Alphen oscillations