Spin triplet superconductor UTe$_{2}$ 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 UTe$_{2}$. 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 UTe$_{2}$ 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 UTe$_{2}$ from the first-principles approach.
Visualizing the low-energy electronic structure of the triplet superconductor UTe$_2$ through quasiparticle interference
Harvard University（哈佛大学）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；University of Maryland, College Park（马里兰大学帕克分校）；National Institute of Standards and Technology（美国国家标准与技术研究院）；Washington University in St. Louis（圣路易斯华盛顿大学）；Canadian Institute for Advanced Research（加拿大高级研究院）
Electron-Hole Scattering Dichotomy and Anisotropic Warping in Quasi-Two-Dimensional Fermi Surfaces of UTe2
Advanced Science Research Center, Japan Atomic Energy Agency（日本原子力机构先进科学研究中心）；Faculty of Engineering, Niigata University（新潟大学工学部）；Institute of Solid State and Materials Physics, Dresden University of Technology（德累斯顿工业大学固体与材料物理研究所）；Helmholtz-Zentrum Dresden-Rossendorf（亥姆霍兹德累斯顿-罗斯多夫中心）；Institute for Solid State Physics (ISSP), University of Tokyo（东京大学固体物理学研究所）；Institute for Materials Research, Tohoku University（东北大学物质材料研究所学）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理学研究所）；Department of Physics, Graduate School of Science, Kyoto University（京都大学理学研究科物理学系）
Bulk electronic structure of optimally doped Ba(Fe$_{1-x}$Co$_{x}$)$_2$As$_2$
我们报道了高分辨率的体康普顿散射测量结果，揭示了最佳掺杂的铁砷化物超导体Ba（Fe $_{0.93}$ Co $_{0.07}$）$_2$ As $_2$的费米面。我们的测量结果与电子结构的第一性原理计算一致，揭示了$X$为中心的电子口袋和$Γ$为中心的空穴口袋。此外，我们的数据是一致的强三维性的这些表，已被预测的电子结构计算在本地密度近似最小的位置。非相互作用磁化率$χ_0({\bf q}, ω)$的补充计算表明，由于带间费米面嵌套而产生的宽峰，激发了这类材料的超导性的几种理论，在这个家族中测得的费米面的三维性中幸存下来。
Fermi-liquid versus non-Fermi-liquid/'strange-metal' fits to the electrical resistivity in the quantum critical magnetic regime of an unconventional superconductor
Institute for Materials Research, Tohoku University（东北大学材料研究所）；Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院量子材料与技术研究所）；Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS（格勒诺布尔阿尔卑斯大学，法国原子能和替代能源委员会，格勒诺布尔国立理工学院，IRIG，PHELIQS）
Fermiology of the kagome compound LuNb6Sn6 probed by de Haas-van Alphen oscillations
National High Magnetic Field Laboratory, Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室国家高磁场实验室）；Materials Science and Technology Division, Oak Ridge National Laboratory（橡树岭国家实验室材料科学与技术分部）
Excitonic instability of two-dimensional tilted Dirac cones
Dirac-Weyl半金属中的电子-电子库仑相互作用包含了一种新的关联效应范式，它将固态物理的不同领域与相对论对应物杂交。强相互作用的无质量狄拉克费米子的激子凝聚驱动自发质量获取就是这样一个例子，其确切性质仍有争议。在这里，通过聚焦于二维倾斜狄拉克锥的有机盐$α$ -（BEDT-TTF）$_2$ I $_3$，我们表明，激子的不稳定性是由一个小的化学势移动和面内磁场控制。在基于重整化群方法和梯形近似的联合分析中，我们证明了核弛豫速率是扩展参数区域中激子自旋涨落的一个很好的探针。比较核磁共振（NMR）的实验表明，这一结果很好的协议，共同揭示了场诱导，自旋分裂费米口袋相反的电荷极性之间的谷间嵌套的重要性。我们的工作为寻找强相互作用无质量费米子的激子不稳定性提供了一个精确的框架。
Probing the pseudogap and beyond: Examining single-particle properties of the hole- and electron-doped Hubbard model
Stanford University（斯坦福大学）；SLAC National Accelerator Laboratory（SLAC国家加速器实验室）；University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；University of Notre Dame（圣母大学）
Correlation-Driven Orbital-Selective Fermiology and Superconductivity in the Bilayer Nickelate La$_3$Ni$_2$O$_7$
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University（南京大学固体微结构物理国家重点实验室和物理学院）；Collaborative Innovation Center of Advanced Microstructures, Nanjing University（南京大学先进微结构协同创新中心）；Jiangsu Key Laboratory of Quantum Information Science and Technology, Nanjing University（南京大学江苏省量子信息科学与技术重点实验室）
