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We report quantum oscillation measurements on the kagome compoundsATi$_3$Bi$_5$ (A=Rb, Cs) in magnetic fields up to 41.5 T and temperatures downto 350 mK. In addition to the frequencies observed in previous studies, we haveobserved multiple unreported frequencies above 2000 T in CsTi$_3$Bi$_5$ using atunnel diode oscillator technique. We compare these results against densityfunctional theory calculations and find good agreement with the calculations inthe number of peaks observed, frequency, and the dimensionality of the Fermisurface. For RbTi$_3$Bi$_5$ we have obtained a different quantum oscillationspectrum, although calculated quantum oscillation frequencies for the Rbcompound are remarkably similar to the Cs compound, calling for furtherstudies.

Quantum Oscillations in kagome metals CsTi3Bi5 and RbTi3Bi5