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.
@article{arxiv.2102.05558,
title = {Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi},
author = {Hao Su and Xianbiao Shi and Jian Yuan and Yimin Wan and Erjian Cheng and Chuanying Xi and Li Pi and Xia Wang and Zhiqiang Zou and Na Yu and Weiwei Zhao and Shiyan Li and Yanfeng Guo},
journal= {arXiv preprint arXiv:2102.05558},
year = {2021}
}