期刊
PHYSICAL REVIEW B
卷 96, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.241106
关键词
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资金
- Ministry of Science and Technology of China [2013CB921700, 2015CB921000, 2016YFA0300300, 2016YFA0300600, 2016YFA0302400, 2016YFA0401000]
- National Natural Science Foundation of China [11774421, 11274381, 11274362, 11474340, 11234014, 11274367, 11474330, 11674371, 11704394]
- Chinese Academy of Sciences (CAS) [XDB07000000]
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China (RUC) [17XNH055, 14XNLQ03, 17XNLF06]
- Shanghai Sailing Program [17YF1422900]
- CAS Pioneer Hundred Talents Program
While recent advances in band theory and sample growth have expanded the series of extremely large magnetoresistance (XMR) semimetals in transition-metal dipnictides TmPn(2) (Tm = Ta, Nb; Pn = P, As, Sb), the experimental study on their electronic structure and the origin of XMR is still absent. Here, using angle-resolved photoemission spectroscopy combined with first-principles calculations and magnetotransport measurements, we performed a comprehensive investigation on MoAs2, which is isostructural to the TmPn(2) family and also exhibits quadratic XMR. We resolve a clear band structure well agreeing with the predictions. Intriguingly, the unambiguously observed Fermi surfaces (FSs) are dominated by an open-orbit topology extending along both the [100] and [001] directions in the three-dimensional Brillouin zone. We further reveal the trivial topological nature of MoAs2 by bulk parity analysis. Based on these results, we examine the proposed XMR mechanisms in other semimetals, and conclusively ascribe the origin of quadratic XMR in MoAs2 to the carriers motion on the FSs with dominant open-orbit topology, innovating in the understanding of quadratic XMR in semimetals.
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