Spin triplet superconductor UTe2 is widely believed to host a quasi-two-dimensional Fermi surface, revealed by first principal calculations, photoemission and quantum oscillation measurements. An outstanding question still remains as to the existence of a three-dimensional Fermi surface pocket, which is crucial for our understanding of the exotic superconducting and topological properties of UTe2. This 3D Fermi surface pocket appears in various theoretical models with different physics origins but has not been detected experimentally. Here for the first time, we provide concrete evidence for a relatively isotropic, small Fermi surface pocket of UTe2 via quantum oscillation measurements. In addition, we observed high frequency quantum oscillations corresponding to electron-hole tunneling between adjacent electron and hole pockets. The coexistence of 2D and 3D Fermi surface pockets, as well as the breakdown orbits, provides a test bed for theoretical models and aid the realization of a unified understanding of superconducting state of UTe2 from the first-principles approach.
@article{arxiv.2303.09050,
title = {Revealing a 3D Fermi Surface Pocket and Electron-Hole Tunneling in UTe$_{2}$ with Quantum Oscillations},
author = {Christopher Broyles and Zack Rehfuss and Hasan Siddiquee and Jiahui Althena Zhu and Kaiwen Zheng and Martin Nikolo and David Graf and John Singleton and Sheng Ran},
journal= {arXiv preprint arXiv:2303.09050},
year = {2023}
}