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arXiv 2102.05558cond-mat.str-el
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非中心对称半金属LaAlSi中的多重Weyl费米子

Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi

Hao Su, Xianbiao Shi, Jian Yuan, Yimin Wan, Erjian Cheng, Chuanying Xi, Li Pi, Xia Wang, Zhiqiang Zou, Na Yu, Weiwei Zhao, Shiyan Li, Yanfeng Guo

摘要:

非中心对称的RAlPn(R =稀土,Pn = Si,Ge)族,被预测为具有磁性和磁性Weyl态,为研究磁性和Weyl物理之间的关系提供了一个很好的平台。通过高场磁输运测量和第一性原理计算,我们揭示了LaAlSi中的Ⅰ型和Ⅱ型Weyl态.通过对实验结果和理论计算的比较,我们将与Shubnikov-de Haas振荡相关的非平凡Berry相归因于电子费米口袋,它们分别与位于费米能级以上约0.1 eV和正好位于费米能级上的两种类型的Weyl点有关。在强磁场下,还观察到塞曼分裂的特征。这些结果表明,除了探索有趣的物理多Weyl费米子的重要性,LaAlSi作为RAlPn家族中的磁性Weyl半金属的比较也将产生有价值的见解磁性和Weyl物理之间的关系。

英文摘要:

The noncentrosymmetric RAlPn (R = rare earth, Pn = Si, Ge) family, predicted to host nonmagnetic and magnetic Weyl states, provide an excellent platform for investigating the relation between magnetism and Weyl physics. By using high field magnetotransport measurements and first principles calculations, we have unveiled herein both type-I and type-II Weyl states in the nonmagnetic LaAlSi. By a careful comparison between experimental results and theoretical calculations, nontrivial Berry phases associated with the Shubnikov-de Haas oscillations are ascribed to the electron Fermi pockets related to both types of Weyl points located ~ 0.1 eV above and exactly on the Fermi level, respectively. Under high magnetic field, signatures of Zeeman splitting are also observed. These results indicate that, in addition to the importance for exploring intriguing physics of multiple Weyl fermions, LaAlSi as a comparison with magnetic Weyl semimetals in the RAlPn family would also yield valuable insights into the relation between magnetism and Weyl physics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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