Fermi surface topology of the topological nodal-loop semimetal HfP2

作者：Yong Zhang, Yonglong Xue, Sutao Sun, Hao Ren, Gang Li, Jia-Qiang Cai, Ming-Hui Gao, 马佩欣, Yang‐Yang Lv, Chuan-Ying 传英 Xi 郗, Jing Lei Zhang, Shu-Hua Yao, Jian Zhou, Yan Bin Chen, Yan-Feng Chen · 发表于：npj Quantum Materials · 年份：2026 · DOI：10.1038/s41535-026-00926-z · 研究领域：Topological Materials and Phenomena、2D Materials and Applications、Graphene research and applications

Topological nodal-loop semimetals represent an important class of quantum materials and have attracted intense research interest due to their exotic topological states and transport phenomena. Hafnium phosphide (HfP 2 ) is a recently discovered nodal-loop semimetal and its transport properties have not been reported yet. Here, we grew HfP 2 single crystals by the chemical vapor transport method and report the magneto-transport properties under high magnetic fields up to 34.6 T. Pronounced Shubnikov-de Haas (SdH) oscillations with beating patterns were observed at low temperatures. These oscillations originate from two electron pockets and one hole pocket, as cross-confirmed by Hall effect analysis by a two-band model and first-principles calculations of the Fermi surface. Furthermore, the Landau fan diagram analysis for the electron pockets verifies the nontrivial Berry phase, which is consistent to Dirac-type band dispersion in HfP 2 . Our work provides systematic transport characterizations of HfP 2 crystals and sheds more light on the physical properties of topological nodal-loop semimetals.