Lifshitz transition (LT) refers to an abrupt change in the electronic structure and Fermi surface and is associated to a variety of emergent quantum phenomena. Amongst the LTs observed in known materials, the field-induced LT has been rare and its origin remains elusive. To understand the origin of field-induced LT, it is important to extend the material basis beyond the usual setting of heavy fermion metals. Here, we report on a field-induced LT in PrAlSi, a magnetic Weyl semimetal candidate with localized 4f electrons, through a study of magnetotransport up to 55 T. The quantum oscillation analysis reveals that across a threshold field B^* ≈ 14.5 T the oscillation frequency (F₁ = 43 T) is replaced by two new frequencies (F₂ = 62 T and F₃ = 103 T). Strikingly, the LT occurs well below the quantum limit, with obvious temperature-dependent oscillation frequency and field-dependent cyclotron mass. Our work not only enriches the rare examples of field-induced LTs but also paves the way for further investigation of the interplay among topology, magnetism, and electronic correlation.

Lifshitz 跃迁 (LT) 是指电子结构和费米面的突然变化，与各种涌现的量子现象有关。在已知材料中观察到的 LT 中，场致 LT 很少见，其起源仍然难以捉摸。要了解场致 LT 的起源，重要的是将物质基础扩展到重费米子金属的通常设置之外。在这里，我们通过研究高达 55 T 的磁传输，报告了 PrAlSi 中的场感应 LT，PrAlSi 是一种具有局部 4 f电子的磁性 Weyl 半金属候选物。量子振荡分析表明，在阈值场B ^*  ≈ 14.5 T 上振荡频率 ( F ₁  = 43 T) 被两个新频率 (F ₂  = 62 T 和F ₃  = 103 T）。引人注目的是，LT 远低于量子极限，具有明显的温度依赖振荡频率和场依赖回旋加速器质量。我们的工作不仅丰富了场致 LT 的罕见例子，而且为进一步研究拓扑、磁性和电子相关性之间的相互作用铺平了道路。