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Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs

机译:NbAs中的平凡电子与非平凡空穴之间的电子空穴补偿效应

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摘要

Via angular Shubnikov-de Haas (SdH) quantum oscillations measurements, we determine the Fermi surface topology of NbAs, a Weyl semimetal candidate. The SdH oscillations consist of two frequencies corresponding to two Fermi surface extrema: 20.8 T (α pocket) and 15.6 T (β pocket). The analysis, including a Landau fan plot, shows that the β pocket has a Berry phase of π and a small effective mass of ~0.033 m_0, indicative of a nontrivial topology in momentum space, whereas the α pocket has a trivial Berry phase of 0 and a heavier effective mass of ~0.066 m_0. From the effective mass and the β-pocket frequency, we determine that the Weyl node is 110.5 meV from the chemical potential. An electron-hole compensation effect is discussed in this system, and its impact on magnetotransport properties is addressed. The difference between NbAs and other monopnictide Weyl semimetals is also discussed.
机译:通过Shubnikov-de Haas(SdH)的角量子振荡测量,我们确定了NbAs(一种Weyl半金属候选物)的费米表面拓扑。 SdH振荡由对应于两个费米表面极值的两个频率组成:20.8 T(α腔)和15.6 T(β腔)。包括Landau扇形图在内的分析表明,β凹坑具有π的Berry相和小的有效质量〜0.033 m_0,表明动量空间中具有非平凡的拓扑,而α凹坑的琐碎Berry相为0。有效质量为〜0.066 m_0。根据有效质量和β-口袋频率,我们从化学势确定Weyl节点为110.5 meV。在该系统中讨论了电子空穴补偿效应,并讨论了其对磁传输性质的影响。还讨论了NbAs与其他单肽Weyl半金属之间的区别。

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