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<p>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<sub>2</sub>) is a recently discovered nodal-loop semimetal and its transport properties have not been reported yet. Here, we grew HfP<sub>2</sub> 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<sub>2</sub>. Our work provides systematic transport characterizations of HfP<sub>2</sub> crystals and sheds more light on the physical properties of topological nodal-loop semimetals.</p>

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Fermi surface topology of the topological nodal-loop semimetal HfP2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月11日

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  • Yong Zhang,
  • Yonglong Xue,
  • Sutao Sun,
  • Hao Ren,
  • Gang Li,
  • Jia-Qiang Cai,
  • Ming-Hui Gao,
  • Peixin Ma,
  • Yang-Yang Lv,
  • Chuan-Ying Xi,
  • Jing Lei Zhang,
  • Shu-Hua Yao,
  • Jian Zhou,
  • Yan Bin Chen,
  • Yan-Feng Chen

摘要

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 (HfP2) is a recently discovered nodal-loop semimetal and its transport properties have not been reported yet. Here, we grew HfP2 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 HfP2. Our work provides systematic transport characterizations of HfP2 crystals and sheds more light on the physical properties of topological nodal-loop semimetals.