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Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States

Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States

Weyl semimetals are conductors whose low-energy bulk excitations are Weyl fermions, whereas their surfaces possess metallic Fermi arc surface states. These Fermi arc surface states are protected by a topological invariant associated with the bulk electronic wave functions of the material. Recently, it has been shown that the TaAs and …