  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.
