Material realization of spinless, covalent-type Dirac semimetals in three dimensions
Abstract
Realization of a three-dimensional (3D) analogue of graphene has been a central challenge in topological materials science. Graphene is stabilized by covalent bonding unlike conventional spin-orbit type 3D Dirac semimetals (DSMs). In this study, we demonstrate the material realization of covalent-type 3D DSMs R8CoX3 stabilized by covalent bonding. We observe that the carrier mobility μ of Dirac fermions reaches 3,000\,cm2/Vs even in polycrystalline samples, and μ increases with the inverse of the Fermi energy, evidencing significant contributions to charge transport from Dirac electrons. R8CoX3 provides a material platform for exploration of Dirac electrons in three dimensions with wide chemical tunability.
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