2024/11/15 by M. K. Chan, Chan, Mun K., Katherine Schreiber +9 · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2411.10631
openalex publication_date 2024/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The pseudogap state of high-T\rm c cuprates, known for its partial gapping of the Fermi surface above the superconducting transition temperature T\rm c, is believed to hold the key to understanding the origin of Planckian relaxation and quantum criticality. However, the nature of the Fermi surface in the pseudogap state has remained a fundamental open question. Here, we report the observation of the Yamaji effect above T\rm c in the single layer cuprate HgBa2CuO4+δ. This observation is direct evidence of closed Fermi surface pockets in the normal state of the pseudogap phase. The small size of the pockets determined from the Yamaji effect (occupying approximately 1.3% of the Brillouin zone area) is all the more surprising given the absence of evidence for long-range broken translational symmetry that can reconstruct the Fermi-surface.