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Pressure-induced Lifshitz transition in CsV3Sb5 evidenced by the quantum oscillation measurements

Xikai Wen1,*, Zeyu Li1,2,*, Zhigang Gui1, Yuqing Zhang1, Yikang Li1, Yanjun Li1, Qingyuan Liu1, Ziji Xiang1,2, Jiaqiang Cai1,3 et al.

Chuanying Xi3, Jinglei Zhang3, Zhenhua Qiao1,2,†, Jianjun Ying1,2,‡, and Xianhui Chen1,2,4,§

  • *These authors contributed equally to this work.
  • †Contact author: qiao@ustc.edu.cn
  • ‡Contact author: yingjj@ustc.edu.cn
  • §Contact author: chenxh@ustc.edu.cn
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Phys. Rev. Research 8, 013197 – Published 23 February, 2026

DOI: https://doi.org/10.1103/fksg-y9xr

Abstract

CsV3Sb5 exhibits a unique double-dome superconducting phase diagram under pressure, closely linked to its distinctive charge density wave (CDW) order evolution and corresponding Fermi surface reconstruction. The intricate interplay between CDW and superconductivity has garnered significant research interest, particularly in finding experimental methods to investigate Fermi surface evolution under pressure. Here, by measuring the quantum oscillation signals in in-plane resistivity and thermoelectric effect of CsV3Sb5 at various pressures, we reveal for the first time that the Fermi surface of CsV3Sb5 undergoes an abrupt change around 0.4 GPa. This phenomenon may be associated with alterations in the interlayer modulation within the CDW state, which is consistent with our density functional theory calculations. Furthermore, we observe the presence of a Dirac band that may moves away from the Fermi energy as pressure increases. Our findings offer crucial insights into the Fermi surface evolution of CsV3Sb5 under pressure.

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Phys. Rev. Research 8, 013197– Published 23 February, 2026
  • Received 16 July 2025
  • Revised 10 December 2025
  • Accepted 31 January 2026
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