Discovery of Lorentz-violating Weyl fermion semimetal state in LaAlGe materials

Abstract

We report theoretical and experimental discovery of Lorentz-violating Weyl fermion semimetal type-II state in the LaAlGe class of materials. Previously type-II Weyl state was predicted in WTe2 materials which remains unrealized in surface experiments. We show theoretically and experimentally that LaAlGe class of materials are the robust platforms for the study of type-II Weyl physics.

arXiv commentThis paper reports theoretical prediction and experimental discovery together. A detailed theoretical paper describing the topology of the full family of X(Lanthanides)AlGe materials will follow. Other related papers can be found at http://physics.princeton.edu/zahidhasangroup/index_WS.html

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• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Materials: Weyl Semimetals
• Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
• Topological nodal-line fermions in ZrSiSe and ZrSiTe
• Weyl Semimetals, Fermi Arcs and Chiral Anomalies (A Short Review)
• Nontrivial Berry phase and type II Dirac transport in layered material PdTe2
• Discovery of a new type of topological Weyl fermion semimetal state in Mo${}_x$W${}_{1-x}$Te${}_2$
• Field-Selective Anomaly and Chiral Mode Reversal in Type-II Weyl Materials
• Acoustic type-II Weyl nodes from stacking dimerized chains
• New fermions on the line in topological symmorphic metals
• Black hole and Hawking radiation by type-II Weyl fermions
• Experimental observation of anisotropic Adler-Bell-Jackiw anomaly in type-II Weyl semimetal WTe${}_{1.98}$ crystals at the quasi-classical regime
• Experimental realization of type-II Weyl state in non-centrosymmetric TaIrTe${}_4$
• Type-II Weyl cone transitions in driven semimetals
• Coexisted Three-component Bosons and Two-component Weyl Bosons in TiS, ZrSe and HfTe
• Three-component bosons in TiS, ZrSe and HfTe
• On the magnetotransport of Weyl semimetals due to the chiral anomaly
• Anomalous Nernst and Thermal Hall Effects in Tilted Weyl Semimetals
• Epsilon-Near-Zero Response and Tunable Perfect Absorption in Weyl Semimetals
• Anomalous Hall Effect in type-I Weyl metals
• Superconductivity in Type-II Weyl Semimetals
• Asymmetric mass acquisition in LaBi - a new topological semimetal candidate
• Double Andreev Reflections in Type-II Weyl Semimetal-Superconductor Junctions
• High Surface Conductivity of Fermi Arc Electrons in Weyl semimetals
• Emergence of Topological Nodal Lines and Type II Weyl Nodes in Strong Spin--Orbit Coupling System InNbX2(X=S,Se)
• Cyclotron resonance of figure-of-eight orbits in a type-II Weyl semimetal
• Anatomy of Topological Surface States: Exact Solutions from Destructive Interference on Frustrated Lattices
• Imaginary part of Hall conductivity in tilted doped Weyl semimetal with both broken time reversal and inversion symmetry
• Saddle-like topological surface states on the TT'X family of compounds (T, T' = Transition metal, X= Si, Ge)
• Bulk spectroscopic measurement of the topological charge of Weyl nodes with resonant x-rays
• Realising Type II Weyl Points in an Optical Lattice
• Supercurrent-induced Skyrmion dynamics and Tunable Weyl points in Chiral Magnet with Superconductivity