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arXiv · 2004.00314

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

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
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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 W2As3 single crystal. The compound shows a large unsaturated MR (of about 70000% 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.

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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. 2020-04-01. Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3. https://doi.org/10.1038/s41535-019-0197-5

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