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

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...

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Bibliographic Details
Published in:npj quantum materials 2019-11, Vol.4 (1), Article 58
Main Authors: Wang, Jialu, Yang, Haiyang, Ding, Linchao, You, Wei, Xi, Chuanying, Cheng, Jie, Shi, Zhixiang, Cao, Chao, Luo, Yongkang, Zhu, Zengwei, Dai, Jianhui, Tian, Mingliang, Li, Yuke
Format: Article
Language:English
Subjects:
639/301/119/2792
639/301/119/995
639/766/119/2795
Anomalies
Broken symmetry
Change detection
Condensed Matter Physics
Fermi surfaces
Hall effect
Holes (electron deficiencies)
Magnetoresistance
Magnetoresistivity
Material properties
Metalloids
Physics
Physics and Astronomy
Quantum phenomena
Quantum Physics
Single crystals
Structural Materials
Surface structure
Surfaces and Interfaces
Thermoelectricity
Thin Films
Topology
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Summary: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.
ISSN:2397-4648
2397-4648
DOI:10.1038/s41535-019-0197-5