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Two-dimensional (2D) materials, especially their most prominent member,graphene, have greatly influenced many scientific areas. Moreover, they havebecome a base for investigating the relativistic properties of condensed matterwithin the emerging field of Dirac physics. This has ignited an intense searchfor new materials where charge carriers behave as massless or massive Diracfermions. Here, we theoretically show the existence of Dirac electrons in aseries of 2D transition-metal carbides, known as MXenes. They possess twelveconical crossings in the 1st Brillouin zone with giant spin-orbit splitting.Our findings indicate that the 2D band structure of MXenes is protected againstexternal perturbations and preserved even in multilayer phases. These results,together with the broad possibilities to engineer the properties of thesematerials phases, make Dirac MXenes a potential candidate for studying anddeveloping novel Dirac-physics-based technologies.

Dirac points with giant spin-orbit splitting in the electronic structure of two-dimensional transition-metal carbides