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• W4308143708 abstract "Kagome metals $A{mathrm{V}}_{3}{mathrm{Sb}}_{5}$ ($A$ = K, Rb, and Cs) are recently discovered platforms featuring an unusual charge-density-wave (CDW) order and superconductivity. The electronic band structure of a kagome lattice can host both flat bands as well as Dirac-like bands, offering the possibility to stabilize various quantum states. Here, we probe the band structure of ${mathrm{CsV}}_{3}{mathrm{Sb}}_{5}$ via Shubnikov--de Haas 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 frequencies ranging from $ensuremath{sim}2085$ to $ensuremath{sim}2717$ T in thin flakes when the magnetic field is along the $c$ axis. These quasi-two-dimensional frequencies correspond to $ensuremath{sim}52%$ to 67% of the CDW-distorted Brillouin-zone volume. The Lifshitz-Kosevich analysis further uncovers surprisingly small cyclotron effective masses, of the order of $ensuremath{sim}0.1phantom{rule{0.16em}{0ex}}{m}_{e}$ for these frequencies. Consequently, a large number of high-velocity carriers exists in the thin flake of ${mathrm{CsV}}_{3}{mathrm{Sb}}_{5}$. Comparing with our band-structure calculations, we argue that an orbital-selective modification of the band structure is active. Our results provide indispensable information for understanding the fermiology of ${mathrm{CsV}}_{3}{mathrm{Sb}}_{5}$, paving a way for understanding how an orbital-selective mechanism can become an effective means to tune its electronic properties." @default.
• W4308143708 created "2022-11-08" @default.
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• W4308143708 date "2022-11-02" @default.
• W4308143708 modified "2023-10-17" @default.
• W4308143708 title "Emergence of large quantum oscillation frequencies in thin flakes of the kagome superconductor <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>CsV</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W4308143708 doi "https://doi.org/10.1103/physrevb.106.195103" @default.
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