Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi

Abstract

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.

18 pages, 5 figures, 1 table

References in corpus (13)

• Titanic Magnetoresistance in WTe2
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
• Topological Magnetic Phase in the Candidate Weyl Semimetal CeAlGe
• Orbital-Free Density Functional Theory Implementation with the Projector Augmented-Wave Method
• A new noncollinear ferromagnetic Weyl semimetal with anisotropic anomalous Hall effect
• Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
• Observation of Weyl nodes in robust type-II Weyl semimetal WP2
• Bulk single crystal growth of the theoretically predicted magnetic Weyl semimetals $R$AlGe ($R$ = Pr, Ce)
• Origin and Large Enhancement of Large Spin Hall Angle in Weyl Semimetals LaAl$X$ ($X$=Si, Ge)
• Incommensurate magnetism mediated by Weyl fermions in NdAlSi

Cited by in corpus (22)

• Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal
• Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls
• Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi
• Field-Induced Lifshitz Transition in the Magnetic Weyl Semimetal Candidate PrAlSi
• Topological Hall effect in CeAlGe
• Pressure tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe
• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Shubnikov-de Haas Oscillations and Nontrivial Topological State in a New Weyl Semimetal Candidate SmAlSi
• Nonlinear optical diode effect in a magnetic Weyl semimetal
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Weak antilocalization effect and triply degenerate state in Cu-doped CaAuAs
• Temperature-Dependent and Magnetism-Controlled Fermi Surface Changes in Magnetic Weyl Semimetals
• Node-line Dirac semimetal manipulated by Kondo mechanism in nonsymmorphic CePt${}_2$Si${}_2$
• A High-Flux and High-Efficiency Setup for Magneto-Infrared Spectroscopy
• Topological nontrivial berry phase in altermagnet CrSb
• Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Weyl nodes and Kondo interaction in noncentrosymmetric semimetals RGaGe (R=La, Ce and Pr) with long Fermi arcs
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Field-induced magnetic phase transitions and transport anomalies in GdAlSi
• Crystalline electric field excitations in Weyl semimetal \textit{R}AlSi (\textit{R} = Ce, Pr and Nd)
• Zone-selection effect of photoelectron intensity distributions in a nonsymmorphic system RAlSi (R : Ce and Nd)