Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3

作者：Jialu Wang, Haiyang Yang, Linchao Ding, Wei You, Chuanying Xi, Jie Cheng, Zhixiang Shi, Chao Cao, Yongkang Luo, Zengwei Zhu, Jianhui Dai, Mingliang Tian, Yuke Li · 发表于：npj Quantum Materials · 年份：2019 · DOI：10.1038/s41535-019-0197-5 · 被引用次数：23 · 研究领域：Topological Materials and Phenomena、Graphene research and applications、2D Materials and Applications

Abstract Lifshitz transition represents a sudden reconstruction of Fermi surface structure, giving rise to anomalies in electronic properties of materials. Such a transition does not necessarily rely on symmetry-breaking and thus is topological. It holds a key to understand the origin of many exotic quantum phenomena, for example, the mechanism of extremely large magnetoresistance (MR) in topological Dirac/Weyl semimetals. Here, we report studies of the angle-dependent MR (ADMR) and the thermoelectric effect in W 2 As 3 single crystal. The compound shows a large unsaturated MR (of about 7000% at 4.2 K and 53 T). The most striking finding is that the ADMR significantly deforms from the horizontal dumbbell-like shape above 40 K to the vertical lotus-like pattern below 30 K. The window of 30–40 K also corresponds substantial changes in Hall effect, thermopower and Nernst coefficient, implying an abrupt change of Fermi surface topology. Such a temperature-induced Lifshitz transition results in a compensation of electron-hole transport and the large MR as well. We thus suggest that the similar method can be applicable in detecting a Fermi-surface change of a variety of quantum states when a direct Fermi-surface measurement is not possible.