标题： 氮化钽：一种奇特的补偿半金属 显示英文标题

标题： Tantalum Monoarsenide: an Exotic Compensated Semimetal

摘要： 与几十年来广泛使用的半导体如硅和砷化镓相比，半金属直到最近才在凝聚态物理领域受到关注。 电子拓扑性质的实现激发了对狄拉克半金属和外尔半金属的研究兴趣，这些材料被预测会表现出超越经典金属电子理论的非凡特性。 在本通讯中，我们首次报告了由近期理论计算提出的强健外尔半金属候选材料TaAs的电输运特性。 我们的研究显示，这种体材料表现出超高载流子迁移率（$\mathrm{5\times10^5 cm^2/V\cdot{s}}$）并伴随极高的、不饱和的线性磁阻（$\mathrm{MR}$），在9特斯拉磁场下10开尔文时达到5400，在56特斯拉磁场下1.5开尔文时达到2.47$\times$10$^4$。 我们还观察到与极低量子极限（$\sim$8 特斯拉）相关的强烈舒博尼克-德哈斯（SdH）振荡。 对TaAs的进一步研究，特别是在超量子极限区域，将有助于扩展这些奇异电子的拓扑性质的实现。 显示英文摘要

摘要： Compared with the semiconductors such as silicon and gallium arsenide which have been used widely for decades, semimetals have not received much attention in the field of condensed matter physics until very recently. The realization of electronic topological properties has motivated interest of investigations on Dirac semimetals and Weyl semimetals, which are predicted to show unprecedented features beyond the classical electronic theories of metals. In this letter for the first time we report the electric transport properties of a robust Weyl semimetal candidate proposed by recent theoretical calculations, TaAs. Our study shows that this bulk material manifests ultrahigh carrier mobility ($\mathrm{5\times10^5 cm^2/V\cdot{s}}$) accompanied by an extremely large, unsaturated linear magnetoresistance ($\mathrm{MR}$), which reaches 5400 at 10 Kelvins in a magnetic field of 9 Teslas and 2.47$\times$10$^4$ at 1.5 Kelvins in a magnetic field of 56 Teslas. We also observed strong Shubnikov-de Haas (SdH) oscillations associated with an extremely low quantum limit ($\sim$8 Teslas). Further studies on TaAs, especially in the ultraquantum limit regime, will help to extend the realization of the topological properties of these exotic electrons.