标题： 通过横向输运性质研究Weyl半金属t-PtBi$_2$的费米面演化 显示英文标题

标题： Fermi surface evolution in Weyl semimetal t-PtBi$_2$ probed by transverse transport properties

摘要： 非平凡拓扑与超导性的结合开启了新型量子器件的大门。发现具有这些性质的本征材料一起出现，代表了现代凝聚态物理学的一个前沿领域。最近，三角晶系的PtBi$_2$被认为是一个可能的候选者，它是首个I型Weyl半金属超导的例子。然而，关于这种有前景的化合物，仍然有许多方面需要揭示，包括其复杂的能带结构、Weyl点在决定其电子性质中的实际作用以及超导转变的本质。在这项工作中，我们通过霍尔效应和热电效应实验研究了一个t-PtBi$_2$单晶。特别是，我们揭示了其电子性质的变化模式，这与费米面中类似空穴口袋随温度和磁场变化的现象相一致。 显示英文摘要

摘要： The combination of non-trivial topology and superconductivity opens to novel quantum devices. The discovery of intrinsic materials where such properties appear together represents a frontier in modern condensed matter physics. Trigonal PtBi$_2$ has recently emerged as a possible candidate, being the first example of superconducting type-I Weyl semimetal. However, several aspects of this promising compound still need to be unveiled, concerning its complicated band structure, the actual role of Weyl points in determining its electronic properties and the nature of the superconducting transition. In this work, we experimentally investigated a t-PtBi$_2$ single crystal by means of the Hall and Nernst effects. In particular, we revealed a change of regime in its electronic properties, which is compatible with a temperature and magnetic field evolution of hole-like pockets in the Fermi Surface.