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Kagome metals AV$_3$Sb$_5$~(A = K, Rb, Cs) are recently discovered platformsfeaturing an unusual charge-density-wave (CDW) order and superconductivity. Theelectronic band structure of a kagome lattice can host both flat bands as wellas Dirac-like bands, offering the possibility to stabilize various quantumstates. Here, we probe the band structure of CsV$_3$Sb$_5$ via Shubnikov-deHaas quantum oscillations on both bulk single crystals and thin flakes.Although our frequency spectra are broadly consistent with the published data,we unambiguously reveal the existence of new frequencies with large frequenciesranging from $\sim$2085~T to $\sim$2717~T in thin flakes when the magneticfield is along the $c$-axis. These quasi-two-dimensional frequencies correspondto $\sim$52\% to 67\% of the CDW-distorted Brillouin zone volume. TheLifshitz-Kosevich analysis further uncovers surprisingly small cyclotroneffective masses, of the order of $\sim$0.1~$m_e$, for these frequencies.Consequently, a large number of high-velocity carriers exists in the thin flakeof CsV$_3$Sb$_5$. Comparing with our band structure calculations, we argue thatan orbital-selective modification of the band structure is active. Our resultsprovide indispensable information for understanding the fermiology ofCsV$_3$Sb$_5$, paving a way for understanding how an orbital-selectivemechanism can become an effective means to tune its electronic properties.

Emergence of large quantum oscillation frequencies in thin flakes of the kagome superconductor CsV$_{3}$Sb$_{5}$