Understanding how superconductivity competes with other electronic phases in cuprates requires direct access to the hidden non-superconducting low temperature phase, for which Abrikosov vortices provide a unique local probe. We map the doping- and field-dependent evolution of vortex-core states in Bi2Sr2CaCu2O8+δ across a broad doping range spanning the Fermi-surface Lifshitz transition. High-resolution scanning tunneling spectroscopy reveals a striking transformation of the vortex-core spectrum from unconventional, pseudogap-like signatures at moderate doping to more BCS-like behavior beyond a critical doping p∗≈0.21. This crossover aligns with the pseudogap endpoint and the onset of Fermi-surface reconstruction, indicating a direct link between pseudogap physics and vortex electronic structure. Our findings highlight the vortex core as a sensitive local probe of the cuprate ground state.
@article{arxiv.2512.13588,
title = {Vortex core spectroscopy links pseudogap and Lifshitz critical point in a cuprate superconductor},
author = {Tejas Parasram Singar and Ivan Maggio-Aprile and Genda Gu and Christoph Renner},
journal= {arXiv preprint arXiv:2512.13588},
year = {2025}
}